Malicious PDF — malware analysis report

Static analysis result for SHA-256 61798294d38d4f8b…

MALICIOUS

PDF

83.3 KB Created: 2021-04-20 01:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96c72f2942ef7c4e8452993d46ec22b4 SHA-1: 1d697faba99debdfa06c00a203b08955538fd5de SHA-256: 61798294d38d4f8be56e0825d0d597c31bbf8f8d9f6e9469884871423e95b14b
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains multiple suspicious external links. The PDF_SEO_LINK_FARM and PDF_SUSPICIOUS_LINK_LURE heuristics indicate a pattern of hosting numerous links, likely to facilitate phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an intent to redirect users to malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://xezojetit.ru/strik?utm_term=ada+mp1+vs+mp+1+classic
    • https://cdn.sqhk.co/pasezateda/aFrhjzw/police_seizure_auctions_washington_state.pdf
    • http://managerprogram.live/guesstimate_questions_and_answersgjb2r.pdf
    • http://kinoxca.xyz/39896671114uup74.pdf
    • https://cdn.sqhk.co/wanaxowuwot/2agjtih/galaxy_emoji_cute_wallpapers.pdf
    • https://cdn.sqhk.co/dekavaka/Djgb9hd/70819647608.pdf
    • https://cdn.sqhk.co/gixobujikelu/aAk2iMS/cat_jump_starter_cj1000dcp.pdf
    • https://cdn.sqhk.co/zoluwumenad/ZLOgghi/cthulhu_movie_2019.pdf
    • http://1xbets-reg.site/what_fast_food_is_giving_free_food334j2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_752d435b43124de982e1eb4afa6136c6.pdf?index=true
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_cb4eae815db5469a82081f7f9ff589ba.pdf?index=true
    • https://s3.amazonaws.com/wizitifowubux/dictionary_english_to_french_free.pdf
    • https://s3.amazonaws.com/vuzufexarevima/zuvizofirozunedulitu.pdf
    • https://s3.amazonaws.com/rovikibixu/51664819230.pdf
    • https://s3.amazonaws.com/viwoxuz/78162425897.pdf
    • https://s3.amazonaws.com/nunakixuma/downy_dryer_sheets.pdf
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_ad33bd0d8b7547108717f57d926e7d12.pdf?index=true
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_e5fa7861d8b04768aba49d2619951280.pdf?index=true
    • https://s3.amazonaws.com/dujepav/alpha_kappa_psi_facilitator_guide.pdf
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_c9d9d5d0480148cab83917ffa9acdb3e.pdf?index=true
    • https://db6a684c-bd73-4a61-997a-17040cc1d896.filesusr.com/ugd/bbbb20_7c56eff2f2ac49e3876e2f9da96e800f.pdf?index=true
    • https://s3.amazonaws.com/jowutoneranemuk/nawisajimufejikixasijo.pdf
    • https://s3.amazonaws.com/vuxagixil/aghorastra_maha_mantra.pdf
    • https://s3.amazonaws.com/jodabiladezot/baby_doll_m_sone_di_ringtone.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001039c.bin
0870be2b54a4e5eb45a01f8c59caeef53c90005c8e4e510fccdac1b1983aa352		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 5224 bytes
font_01_sfnt_off0001155b.bin
5edd08a200b9501a9fab7e110c0f275abe36b6fd67908d7e897d51d05c0dc53c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1155B 12988 bytes

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