Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8aee67ca7cf4faa…

MALICIOUS

PDF

72.2 KB Created: 2021-05-31 20:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d0c943b118c97df925e0f922fc5b7ad6 SHA-1: 2276b183bd475268d1ca060b8ab130df45d7a338 SHA-256: f8aee67ca7cf4faaf88d60eb7f16513a01423751528443d76845f68bfb76c349
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 domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to 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 0.9996

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://smidgel.ru/pbw?utm_term=what+is+the+significance+of+the+title+to+kill+a+mockingbird+essay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381105/normal_60637e83baa65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384150/normal_5ffd7ad9f28c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_60595ddbcb81f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_6044fd4bd0129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422367/normal_604b02876fcb0.pdfIn PDF document text
    • https://pegepigav.weebly.com/uploads/1/3/4/4/134481067/f5c28ba7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424689/normal_5ffe160c2ef1c.pdfIn PDF document text
    • https://diborukokaw.weebly.com/uploads/1/3/0/8/130814192/minalomul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426944/normal_5fdb286ca38eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kapetipubi.pbworks.com/w/file/fetch/144421644/un_lugar_en_silencio_2_fecha_de_estreno_peru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a41d873-75f7-486d-8e05-d966c67acf8a/what_does_the_jail_cell_symbolize_in_monster.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144417096/wagen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f682653-5c0c-45e1-8418-0004d4a25e1a/71755438867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd697176-5fb7-4a54-b102-5b09558eb44d/how_to_study_for_sat_subject_test_math_1.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144412455/zurudexuvekivojodimone.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144413997/can_you_cook_stuffed_chicken_breast_on_the_grill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9157f6ae-7eb6-4480-8c2c-8f6f07c4a653/story_mckee_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9a46587-1ca9-413a-be90-b81d972be881/tijafuxuwelemiduwaketuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af8ca475-fa10-4cc2-9d0e-76276a02fef7/jidiwimesokumiripumej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2cde21d-f89e-48ae-9a90-6f4a26e9961f/68704329244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5ae39cf-c012-4c6b-ba8a-a8031d5f5da1/tanemifisotutub.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/24500522515.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 5752 bytes
SHA-256: 4d494cdf65b22a7e3a300334edca8d01a0742c26f2779e160a3591970a18a8b7
font_01_sfnt_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 9924 bytes
SHA-256: e7da595b46362dc2888259cb04c8ad66880188fe7acb52843b76bfa6ab3a077d