Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc43af87962da3c0…

MALICIOUS

PDF

81.3 KB Created: 2021-03-19 07:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29b4c577aa899d065cdfbb7a6072ba7f SHA-1: b0194eae702439fab81c5d27848194762662971f SHA-256: fc43af87962da3c06fd9d385cc77dbcb331fb5634ece4bf8b904f791e98add58
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external links, with one prominent URL pointing to 'lozipotod.ru', suggesting a phishing or content-farming attempt. The presence of embedded JavaScript, although not fully detailed, is a common vector for malicious PDF exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/wix?keyword=chapter+5+quiz+1+algebra+2
    • https://static.s123-cdn-static.com/uploads/4366367/normal_5ff3ffc5cea2f.pdf
    • https://tesomibafakaxag.weebly.com/uploads/1/3/4/3/134368706/5932406.pdf
    • https://static.s123-cdn-static.com/uploads/4454161/normal_5fdf080e92778.pdf
    • https://zipebamaxotunev.weebly.com/uploads/1/3/2/8/132814247/rojolebowu.pdf
    • http://nobirejajatit.iblogger.org/bumazobufepesudebo.pdf
    • http://milafikolume.iblogger.org/bony_mwaitege_mke_mwema_video.pdf
    • https://xemizumelisiga.weebly.com/uploads/1/3/1/8/131856695/272a07c2.pdf
    • https://cdn-cms.f-static.net/uploads/4389793/normal_602da53a95a8f.pdf
    • https://tulidakavixesa.weebly.com/uploads/1/3/5/3/135347336/suwebudeboget-tixunapigo.pdf
    • https://dasovarelebeji.weebly.com/uploads/1/3/4/7/134712834/8673057.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kuxiguzemafuj.rf.gd/geographic_information_systems_jobs_outlook.pdf
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_ebf69548a4d24b76b35bf5b05f64a282.pdf?index=true
    • http://votofeki.epizy.com/99788584751.pdf
    • http://toxisokipefofo.epizy.com/timex_nature_sounds_alarm_clock_manual_t621t.pdf
    • http://rujujarorimepa.rf.gd/30350290177.pdf
    • https://s3.amazonaws.com/pomaxa/free_acapella_songs.pdf
    • https://s3.amazonaws.com/dalava/58426298897.pdf
    • http://sifopowi.rf.gd/farmacos_coagulantes_y_anticoagulantes.pdf
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_c20f61a24bd54e76b6ca69b82b9f81c1.pdf?index=true
    • http://ketawod.epizy.com/88389596314.pdf
    • https://s3.amazonaws.com/zoluwivebiro/55185731652.pdf
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_432071bf2862462f90cdaf2945ae05df.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef19.bin
910594d6cc2fccdf37fc0f6bf91c4959dbea6cc02cb78461dc86eea9278e358a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 5216 bytes
font_01_sfnt_off000100fe.bin
c40b628bf303fc800d3a63a608c6665d545b5ec89577d009d4afb2d4ab895a91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 12184 bytes
font_02_sfnt_off000129b9.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129B9 4324 bytes

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