Malicious PDF — malware analysis report

Static analysis result for SHA-256 077af9d27b943b21…

MALICIOUS

PDF

76.4 KB Created: 2021-02-28 11:48:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 028b969059406ee7d96872f282393865 SHA-1: 3fe7b7f56206ad83f0e5340698efbce5efe541b5 SHA-256: 077af9d27b943b21bdcb2690569c3b6e84529d4b7fd577a78a17128c849533ab
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to essay writing, which is then redirected to a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://midufefew.ru/award?keyword=how+to+write+a+descriptive+essay+for+grade+6 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443801/normal_5fca7485ad43f.pdfIn PDF document text
    • http://fudidudigas.iblogger.org/digital_designs_6.5_door_speakers.pdfIn PDF document text
    • http://topstudy.fun/cva_bleeding_adalah07e14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383314/normal_5fd76dd1f2188.pdfIn PDF document text
    • http://vaxunugaso.22web.org/best_rated_dishwashers_2019_consumer_reports.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_5fdaf7b900003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409602/normal_5fdb7828deb38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470521/normal_5fe0e5228453b.pdfIn PDF document text
    • http://winwites.space/atf_box_latest_setup_free97wzs.pdfIn PDF document text
    • http://helpcreditscore.info/jilanejututizibitinibu2m1e6.pdfIn PDF document text
    • http://fufivepibagat.iblogger.org/napemofivugumuton.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_601d709aeccbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_5fd825a2004bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wenumuno.rf.gd/tennessee_waltz_sheet_music_piano.pdfIn PDF document text
    • http://netixino.epizy.com/whirlpool_extra_fridge_shelf.pdfIn PDF document text
    • http://tobezizasatixib.epizy.com/32550849715.pdfIn PDF document text
    • http://tugosujamas.rf.gd/16179034704.pdfIn PDF document text
    • http://losotejusegiso.rf.gd/dunkin_donuts_nutrition_french_vanilla_iced_coffee.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_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 5660 bytes
SHA-256: f0a31d0aea29a6c00cf432cc55c48e64a1abc429ac66ab158c1df6caedb8923e
font_01_sfnt_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 10068 bytes
SHA-256: b72a35111e9f63ef7365c6d6d2181838dd3a25812fccc0de5c47677ad75e5314

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