Malicious PDF — malware analysis report

Static analysis result for SHA-256 512e803fdda1353e…

MALICIOUS

PDF

76.0 KB Created: 2021-03-20 12:26:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1830e2134b6b71671cd2e76d8dbf5922 SHA-1: 59cbc2a67248329aedb497d7ff5cfe9f152e7d9c SHA-256: 512e803fdda1353ed0968d0dc7b4f937556e70263af3ced36757e9952cc12891
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains a query related to 'gold's gym selling equipment', likely a lure to direct users to one of the embedded malicious URLs. No scripts were extracted, but the presence of numerous disposable domains and link farms suggests a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=is+gold%2527s+gym+selling+equipment
    • http://free-at.pro/c_platform_toolset_v100gyawc.pdf
    • https://static.s123-cdn-static.com/uploads/4422884/normal_5fe501349285f.pdf
    • https://cdn.sqhk.co/jukowejazus/yPgfWLb/activex_microsoft_windows_8.pdf
    • https://cdn-cms.f-static.net/uploads/4385410/normal_60350cab12bbc.pdf
    • https://cdn-cms.f-static.net/uploads/4372383/normal_60160bfd78906.pdf
    • http://iglivesupportteam.com/2748057794qkof7.pdf
    • https://cdn.sqhk.co/mujawiru/aiiadOo/zowowavewofuzosul.pdf
    • https://naxozafo.weebly.com/uploads/1/3/1/4/131483391/2f93361.pdf
    • http://ranking-se.com/dogomakeperepuriwadopowikqn3i.pdf
    • https://static.s123-cdn-static.com/uploads/4449629/normal_5fef38d8775e5.pdf
    • http://clobuss.ru/86466730617jobee.pdf
    • https://cdn-cms.f-static.net/uploads/4455380/normal_5fe679704c0af.pdf
    • https://fujolununepa.weebly.com/uploads/1/3/4/6/134683680/7048759.pdf
    • http://mediaverifiedbadge.com/nunegapijinat8syi.pdf
    • https://cdn.sqhk.co/vekosozob/jj2pjcz/15409201350.pdf
    • https://static.s123-cdn-static.com/uploads/4466411/normal_600533f26ba00.pdf
    • https://static.s123-cdn-static.com/uploads/4468296/normal_5fde41fc23344.pdf
    • https://tixowofo.weebly.com/uploads/1/3/4/5/134592641/wofezusaza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nevovumowa/vijowovo.pdf
    • https://s3.amazonaws.com/sewamos/88671415292.pdf
    • https://s3.amazonaws.com/xutomoxu/bailamos_video_song_free_for_mobile.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_off0000edff.bin
089feb1dcd70c1ed329e5e847da4b617621c77792199d958521be6557b2b73a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 5172 bytes
font_01_sfnt_off0000ff92.bin
b1b43a0ebb7dad6875362d4b836183ee338157b8c4d3f318637d8c960a41e5eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 10308 bytes

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