Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42d3018e7f88441…

MALICIOUS

PDF

79.3 KB Created: 2021-05-20 20:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5f20a2e7dc3f39ced6dee919f4ca37b0 SHA-1: db12f14b7e7d8c281562a88cfdab003aa55ac308 SHA-256: f42d3018e7f88441f6bcd9c5902f1034b226284d4c6120bfad8f094ef5b8817a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'maypoin.ru', which is likely a malicious domain used for phishing or malware delivery. The document body, though heavily obfuscated, suggests a technical topic ('How to check volts with a cen-tech multimeter') to entice users to click the malicious link.

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://maypoin.ru/strik?utm_term=how+to+check+volts+with+a+cen-tech+multimeter PDF link annotation
    • https://maritomumotoko.weebly.com/uploads/1/3/4/5/134512683/e40e3de485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473388/normal_601b6699a7e00.pdfIn PDF document text
    • https://penegekefifix.weebly.com/uploads/1/3/4/5/134586424/lupetam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465270/normal_60347795d22bf.pdfIn PDF document text
    • https://wenewosu.weebly.com/uploads/1/3/4/2/134266389/gimedozubepefikela.pdfIn PDF document text
    • https://xufolonul.weebly.com/uploads/1/3/2/6/132695880/8c7cc64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416927/normal_5ff0a3a71a3d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_605d99cc0e0af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417032/normal_6000512528fe1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492245/normal_604871a2cc83e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_5fd5ff0057153.pdfIn PDF document text
    • https://kesiwupi.weebly.com/uploads/1/3/1/4/131407351/6175936.pdfIn PDF document text
    • https://xinifusat.weebly.com/uploads/1/3/4/3/134321574/e24a6a8ef0685.pdfIn PDF document text
    • https://dexajuvado.weebly.com/uploads/1/3/4/4/134470202/pizexakat.pdfIn PDF document text
    • https://levevozupub.weebly.com/uploads/1/3/1/4/131407214/wirowadafukir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/63933451417.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/birozonawigogelupare.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/xaxiwejejipuvut.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/15195641770.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/wovidovadukugituxaro.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/warhammer_fantasy_battle_4th_edition_magic.pdfIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 5248 bytes
SHA-256: 98fa3e839a4fd619f1060354c8a71c32c5f355400fc468b86388ef491e806f55
font_01_sfnt_off000108de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 11396 bytes
SHA-256: 4ce80f83a3769bc30623c0d3cf894e7f19d3f69a8f961e7cf66177ef17281374

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