Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7af1618a454948…

MALICIOUS

PDF

78.0 KB Created: 2021-03-10 22:10:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 181d4d8b040c1845b8f2c90c2ae72db8 SHA-1: 280baac2110a45711c533f567416e50dc4e00373 SHA-256: 7b7af1618a45494850fc7c03ae5f770046baf45b41a276ef601c30e8008eae5a
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure, likely related to search engine optimization or document delivery, to encourage clicks on these malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=apoplejia+isquemica+pdf In PDF document text
    • http://ig-copyrightnotice.com/words_to_describe_sunbeammhx1l.pdfIn PDF document text
    • http://repair-monokoles.ru/tejeduposolomurepiyfqdm.pdfIn PDF document text
    • http://rukozhop-guide.com/difference_between_crack_and_fractured_tooth_root_symptoms3we45.pdfIn PDF document text
    • http://nukels.xyz/gestion_de_la_paie_coursxzfs6.pdfIn PDF document text
    • http://gsmall.space/73659630836cnuns.pdfIn PDF document text
    • http://cloudmarket.website/363453473499x9z5.pdfIn PDF document text
    • http://xtw2.club/hp_officejet_6700_premium_repair_manualrdi8p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449602/normal_601909d41eab1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449599/normal_602ecdb119870.pdfIn PDF document text
    • http://sinoniwim.22web.org/york_diamond_80_furnace.pdfIn PDF document text
    • http://babarogumo.iblogger.org/96170559771.pdfIn PDF document text
    • http://xulenegutuwovi.iblogger.org/92218341440.pdfIn PDF document text
    • http://allieshouseofhope.com/how_to_write_an_authors_statemento982x.pdfIn PDF document text
    • http://mx50off.pro/nupugubr3cbo.pdfIn PDF document text
    • http://podarokinsta.online/nudiwdvxds.pdfIn PDF document text
    • http://nashremont.site/vizio_2.0_sound_bar_20_inch_reviewvtbfz.pdfIn PDF document text
    • http://spoonnumberone.xyz/88964045063u3irf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bifurul.rf.gd/the_developing_person_through_the_lifespan_7th_edition.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_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 5396 bytes
SHA-256: 31fe5ee59bfa8131e7ca3776a2967f831e1eb87613f7219be69862eaddcf8f8a
font_01_sfnt_off0001074d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074D 10460 bytes
SHA-256: 871903a175da94b8cb157f7bd665da650dfc9566f8273720c1bb991358ebe2af

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