Malicious PDF — malware analysis report

Static analysis result for SHA-256 873dd0a280da33c9…

MALICIOUS

PDF

77.2 KB Created: 2021-04-16 00:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 67143dbbc42a5ec40f5d9ae978c0393d SHA-1: 267955fac08646d1947377026d4bb3a5666e139e SHA-256: 873dd0a280da33c97339db40b73ac57b45e3cd02960fef1ae55d235e9c945260
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, appears to contain search-related keywords, further supporting the lure of external content. No scripts were extracted, but the presence of numerous external URLs indicates an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/strik?utm_term=how+to+repair+car+wash+machine PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450340/normal_5fd650e05ff37.pdfIn PDF document text
    • http://vir-tus.com/24345159849fhdd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425230/normal_600d37e26f97a.pdfIn PDF document text
    • https://fuvipizewovotat.weebly.com/uploads/1/3/1/0/131069886/zofesu.pdfIn PDF document text
    • https://suzigenetulaja.weebly.com/uploads/1/3/4/7/134756603/b1c89788dd.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/HxQhKjg/earthlink_internet_plans.pdfIn PDF document text
    • http://dalnoboyi.xyz/launch_trampoline_parkw4qkw.pdfIn PDF document text
    • https://cdn.sqhk.co/lapitobexeva/PHaVmhc/dofinofebow.pdfIn PDF document text
    • http://islta.fun/beginner_guitar_chords_left_handedr1s1v.pdfIn PDF document text
    • https://gunujudota.weebly.com/uploads/1/3/2/3/132303168/9413ac75.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/6Mujcie/music_player_audio_player_equalizer_bass_booster_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494149/normal_5fed241d2231b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417998/normal_5fdd1ec45132c.pdfIn PDF document text
    • https://tegomufowake.weebly.com/uploads/1/3/5/9/135958876/nufixerususa.pdfIn PDF document text
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/4b3263.pdfIn PDF document text
    • http://crawlmqyu.space/hotstar_app_free_without_play_storeumcsl.pdfIn PDF document text
    • https://jojapewabivato.weebly.com/uploads/1/3/1/3/131379205/8948978.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/I5tgdgh/zujezava.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459482/normal_60018bd8a37a8.pdfIn PDF document text
    • http://lishop.site/98283628498az9ge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_9343a34440a048eda4c4e7919c02a5be.pdf?index=trueIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_154214aaecba4adfaf97d72873c8ad90.pdf?index=trueIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_4dfec626ba9248f1aadc3ada075f483d.pdf?index=trueIn 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_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 5196 bytes
SHA-256: d926542153b90073443e9e6bd03e286622f27b51f2a9f6d7a5fc223af9215726
font_01_sfnt_off00010182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10182 11020 bytes
SHA-256: daa65b518bf8c9a1545238afc149a1c04110155a9f78a341ff9ae8c37ce00f40