Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f2ba5fa8900d28…

MALICIOUS

PDF

86.8 KB Created: 2021-03-22 02:31:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6a66d3f476074636f0413b47fef77d37 SHA-1: b3546be66069720445f90a60b464b6a08075b59f SHA-256: 23f2ba5fa8900d28fa38a19824061d2b82e08ab9da1baac41c384775178b5535
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/wix?keyword=toro+snow+blower+manual+pdf PDF link annotation
    • http://dororuminaxa.mywebcommunity.org/how_to_apply_iron_on_vinyl_to_cricut_mat.pdfIn PDF document text
    • http://mokugujumekov.sportsontheweb.net/48458888768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/980b83df-87cb-4a3e-ab5f-6dc5f74ce58d/english_short_stories_for_beginners_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2fb2a10-836a-430d-9fb4-9b824b8b5886/bonijiso.pdfIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_9a4e978ae602464daeef34ef51aff43f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1a06018-8104-4972-aee3-3af546c0d825/66927537018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de7024b-9686-4946-b2ce-e9434e06f865/fopodajadifut.pdfIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_a18eedbc0d2d4f649bac5d719da3e564.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f02e8d2f-9725-4830-a9f3-5416d41f06cd/how_to_set_a_universal_remote_to_a_toshiba_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8e0ec40-2f5e-482d-9b9f-436afde54a8a/pikedaru.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_a3acac69e7134a2ca8e26adbca6bd5af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3daf4d0-0b1a-4ae6-b7f5-c68922c09bf6/can_cancer_cause_blood_clots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa473ec-b160-4201-b622-cf532e35e529/what_is_the_moral_lesson_of_annabel_lee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4582963f-3367-4da9-af9a-c956b279393f/94294448926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4c304a3-417d-46f3-b41b-a8b34108581a/40827659431.pdfIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_a9544e84476149b293d712c897845e8f.pdf?index=trueIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_57969483d8514f9d94e529f954f5fa6a.pdf?index=trueIn PDF document text
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_649a7acf4d07425596d7ee2010a03631.pdf?index=trueIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_e1f4a507b2204ef2b5a6d92adaa4abd9.pdf?index=trueIn PDF document text
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_ba71991557d94a1cb53d73a50537cd1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/edec4258-cb35-44a5-988c-261d2f9d299f/history_of_islam_in_bangla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecbe62f2-26e6-46c7-b748-566b7299bd11/fopogekutigapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d148ec-59b8-4654-978d-4fad23d0427d/how_to_tell_if_drill_bit_is_for_concrete.pdfIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_00bdbe6eab5045f8bc807582a431447b.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 5120 bytes
SHA-256: 004681a2630e15549a3ac2e30570f097f08f27e3f79f2b4e9bd3a3cc408474eb
font_01_sfnt_off000119fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FA 11116 bytes
SHA-256: ffdb46b7cf1cc01659a7b691ab85d2216dfaaaaecabc42dd8a8b551d1a0f4def
font_02_sfnt_off00013fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC9 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2