Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ddfcf6ae470ca32…

MALICIOUS

PDF

75.1 KB Created: 2021-04-07 08:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 917697b39b127466607519038ec628b4 SHA-1: c2f360482c8979c3839219ad05e2161089b1f284 SHA-256: 7ddfcf6ae470ca3230f28d6b8f7609e4e74012ac343a9ebb4d0239231aacdbe7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it is a link farm on disposable hosting, with numerous embedded URLs pointing to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to a worksheet, which is likely a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/wix?keyword=pythagorean+theorem+applications+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366668/normal_60691df9ce867.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387819/normal_5ff2a0183c287.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413126/normal_5fe3ee68319f6.pdfIn PDF document text
    • https://jimigafekalese.weebly.com/uploads/1/3/1/4/131407537/wedavaxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474736/normal_5feb447737f67.pdfIn PDF document text
    • http://sunipemumax.66ghz.com/92712212780.pdfIn PDF document text
    • https://zejifibesus.weebly.com/uploads/1/3/4/5/134586543/3794310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478387/normal_605584367d03e.pdfIn PDF document text
    • https://dijibelusubif.weebly.com/uploads/1/3/4/8/134871127/bidosiw_zazagafopetuved_borolumeba.pdfIn PDF document text
    • https://dijavagom.weebly.com/uploads/1/3/5/3/135325372/farobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445879/normal_60684c0d1cce6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wukinirivinejug.epizy.com/lemolofiwavonoferiwafev.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/what_qualification_for_indian_navy.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/32817378407.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/kyurinaga_s_revenge_achievement_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b2b716b-0629-4ac4-8bc0-af60a7032833/the_untethered_soul_the_journey_beyond_yourself_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb75b43-9592-4547-9c01-afb47977dfb0/takelegijuvanuselodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/def5992f-a8c0-4d59-9951-9d687cdd5c92/r._b._cialdini_influence_science_and_practice.pdfIn PDF document text
    • http://tapalif.epizy.com/autocad_2008_full_crack_32bit.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_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 5608 bytes
SHA-256: 10f276383f87b0f89266dd28478cd4a59ce74502618ed595999a47f048a305ba
font_01_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 10664 bytes
SHA-256: feda2737dfb75a672f529478f43487c4d93f87bde67b9b64c684211aab6d4fc5

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