Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bea0af5905f641…

MALICIOUS

PDF

73.7 KB Created: 2021-02-25 06:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f5a1bb26a58d20f6000797a4c9d9e6a4 SHA-1: cb669b7b7cd501cd24db4879cdef69bef923d8c5 SHA-256: a5bea0af5905f641c1b80be79665caa1a51008b89ef9b8e0718bf2f58b5bfe16
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various domains, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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 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.
  • 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=estructura+de+lewis+del+acido+sulfuroso In PDF document text
    • http://creamwalls.space/translate_chinese_to_english_documentql0q2.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/BvQhhHl/forupanepabusujiv.pdfIn PDF document text
    • https://cdn.sqhk.co/matajikiwov/jfxhdrD/ninja_tobu_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rebabafa/K1Kha2s/uefa_champions_league_winners_2019.pdfIn PDF document text
    • https://dozetiwe.weebly.com/uploads/1/3/1/8/131856451/5872716.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/55014308322.pdfIn PDF document text
    • https://cdn.sqhk.co/zafowavo/ZjfhhWA/xabozosasosovidufe.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/tojesenezowejotavinepoxam.pdfIn PDF document text
    • http://dom-bita.org/good_morning_my_love_photos8ju7a.pdfIn PDF document text
    • https://cdn.sqhk.co/fokatekox/iclcia9/bottle_shooting_game_2.pdfIn PDF document text
    • https://cdn.sqhk.co/penazavoxu/f6qgTgi/moto_z2_force_moto_actions_not_working.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/impact_of_globalization_on_business_culture.pdfIn PDF document text
    • http://genusttwsr.fun/dutufopututelojoburipapioidev.pdfIn PDF document text
    • https://nokaxogu.weebly.com/uploads/1/3/4/5/134520383/segijotukixesevakora.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvukidovime/uzCidJY/53648049495.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/panasonic_kx-tes824_factory_reset.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/dSHHcs9/xbox_one_gaming_headset_7._1_surround_sound.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 5064 bytes
SHA-256: 47b6c82c5d132f18565cb8fff6c4a4100d1af57c2bc93b1b4c2d1f0b90a67e14
font_01_sfnt_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 11840 bytes
SHA-256: 70e13b84c20208b3c9b962603976d9ce04d9597a04d152ffe2e62c45186e5af3

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