Malicious PDF — malware analysis report

Static analysis result for SHA-256 af98e0a25f6ff90c…

MALICIOUS

PDF

81.4 KB Created: 2021-03-16 17:09:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 48efd745a705d83a6f940dcb15e71a75 SHA-1: 0e287032a57e23c3e38c707b59cc5113d4c436c8 SHA-256: af98e0a25f6ff90ccd1e4cc16256c661c97aa5c3c5ff3c384d6d78df7da12f7f
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting, suggesting a link farm designed to manipulate search engine results. One prominent URL, 'https://resalured.ru/wix?keyword=us+marine+corps+shooting+jacket', appears to be a lure for users searching for specific terms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/wix?keyword=us+marine+corps+shooting+jacket PDF link annotation
    • 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/6073cc32-afbf-4a41-b18c-2aed14c31446/solenuxufilol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b0ad6a1-070e-401b-afd8-ee32714ab5df/whirlpool_quiet_partner_ii_wont_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea369af-25ae-4dbb-8fb6-cc8a5fda9837/bosch_silence_plus_48_dba_not_draining.pdfIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_a627d88c42514b37962c8a3d755ceb25.pdf?index=trueIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_8cc5373293de4b13bdacb9aa260c3194.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b31c341-d089-4a70-a246-539e4c2f76ee/45107167465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/660adfb3-9a31-4c93-b4a1-168ebe82ab6c/bluebook_citation_20th_edition_india_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf05df79-f214-4e6f-8f2a-7b40fe80ff8f/fasabezoxuzowa.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_3f4d846e187d473fba7b97dc0a2e6092.pdf?index=trueIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_95f40a3cb9504790bbb01830b27d5fbf.pdf?index=trueIn PDF document text
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_397cdf5b800f40e89d91d128445e2f3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/libajejobokiwuvivuribof.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_acb01cc0497747e5b6f85086cafe873a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0fb9c8d-e3f1-49d8-bcae-dbcfc631190c/lista_de_verbos_irregulares_en_ingles_pasado_participio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8069e8ae-567a-4f1c-b040-e5e3a4376f8b/is_it_safe_to_eat_salad_from_a_restaurant_during_covid.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/lawn_boy_gold_series_2_cycle_lawn_mower_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8400766f-e37f-4a51-b214-84bc599af3a8/fativaxalevonenufaxis.pdfIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_a03033a3c46c4288ac5be8b87721f5ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/blitzball_recruit_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b412d2d-b308-4908-95c3-9b3252d3c006/zujikunume.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 5236 bytes
SHA-256: ca630916697e85e5d5ccfd70bf2800338d9e36262d3b486befb571929e06f197
font_01_sfnt_off0001037b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 11468 bytes
SHA-256: 309101caa5eaf09d13333e30939bedfead81fc7255033598d3589aac73161409
font_02_sfnt_off00012a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A54 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71