Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2b7947e69ed9ce…

MALICIOUS

PDF

83.6 KB Created: 2021-03-28 19:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b2a454b46e311243b964835c64c9a578 SHA-1: b97c7a79170a86241e30d09077418346fa0d1d67 SHA-256: fb2b7947e69ed9cee51e69b6a96b5f51d35773f53f9e8e39a40f0c1055f4b4c3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing numerous external links, many of which point to disposable domains and are likely part of a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs suggest a phishing or malicious redirection scheme, aiming to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/strik?utm_term=difference+between+depression+and+melancholy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500897/normal_603b369868797.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481061/normal_5fec87783b756.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/wekojokafujobeninasite912ja.pdfIn PDF document text
    • http://idealslimitaly-official.site/sanuxogabedogoguvazpv332.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491432/normal_5fcedcd595f86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389820/normal_5fe53e4219cc7.pdfIn PDF document text
    • http://bestcreditcheck.info/sopejenarikizirenefejpq7v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382974/normal_5fcf4bf79a410.pdfIn PDF document text
    • http://idem-peshkom.ru/tekavabowisasepinpf9rd.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/90e0121b-0fc3-4d30-ae83-91ef0af2f492/how_much_do_green_egg_grills_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb0e7010-b614-4920-bbf2-2592ac0acf5b/vuvaxiles.pdfIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_27b981be9fba4a58b3123293b07e6332.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/718e9a23-2399-471e-9dcc-214a82507628/nofebomugakafabafawoluwaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad799fcf-5347-4c66-91d3-3f3961560630/63337028377.pdfIn PDF document text
    • https://7fd672c9-0ac8-42d3-9d3c-9ebb2fbea2b4.filesusr.com/ugd/92785a_2ebe4c43fd3b4101ae7c1b11f639ba6b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/404e9d84-a70c-4a59-ad4a-329f436f9f4e/army_cpof_tm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b05fefcc-fd62-428e-8d5e-fb7615835c20/pukerojedudibipukux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/362e41cc-068a-44bc-86c0-559535eb9975/zoxivopezok.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/enlighten_crossword_puzzle_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51f2eea5-fbee-48ea-8ebb-caf35030055b/book_of_the_law_bible_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/nizefat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcc9e6cd-408d-42d7-ade1-67264b00e6e6/felarimaxugevaluxufisos.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_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 5516 bytes
SHA-256: 1e6842d96df28e2962cb00f44a6759ede12d9b12f6b47d6ae22764a6cebd755e
font_01_sfnt_off00010d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D50 10788 bytes
SHA-256: 4cdeb14538f22b1f37dd614fbbe79fc5ccd23043c1d89685e42a0ff3f3f87106
font_02_sfnt_off00013250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13250 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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