Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c4014c7c4b9b76…

MALICIOUS

PDF

74.2 KB Created: 2021-05-09 02:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7f5a9bda974a5797fdcce512b49e292 SHA-1: 50347e5f73bf2c0efab1f10760080666146af15b SHA-256: 85c4014c7c4b9b767d53d1f85b6ce4621d4f33d0dbc85778d4752535e7c03150
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and is detected as malicious by ClamAV and an ML classifier. The document body, though partially garbled, suggests a lure related to product installation, likely to direct users to malicious sites. No scripts were extracted, but the presence of many external links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=how+to+install+uppababy+vista+cup+holder
    • https://zudibuliri.weebly.com/uploads/1/3/5/3/135319562/tapiwewoporudabibaw.pdf
    • https://sigoxavofilaza.weebly.com/uploads/1/3/4/6/134697452/af0476a0.pdf
    • https://nexojavadu.weebly.com/uploads/1/3/0/7/130775828/zinutidikudi.pdf
    • https://fijakesu.weebly.com/uploads/1/3/4/5/134527503/7e58b6c4493.pdf
    • https://wabelorija.weebly.com/uploads/1/3/4/6/134685543/luzamijadarebo.pdf
    • http://lnstagramsupportinfo.com/the_compound_effect_darren_hardy_quotesfa7m0.pdf
    • https://fazolusafiwef.weebly.com/uploads/1/3/4/5/134585025/3368260.pdf
    • http://save50.pro/nefigatogabixonetagatujhc7xk.pdf
    • http://cookwellbakewell.com/fekuvepabugajaderufizurerai1ib.pdf
    • http://huaweistoreukr.xyz/gevakotitabifonamjrle.pdf
    • https://lisoletabe.weebly.com/uploads/1/3/4/5/134511207/litafiginuroki-xazodigenexad-depojuzebususe-lufafupupojukeg.pdf
    • http://securityverifiedservices.com/77682800333kv6if.pdf
    • http://prosale.company/panasonic_tc-p42x1_audio_outjdgid.pdf
    • https://levevozupub.weebly.com/uploads/1/3/1/4/131407214/wepagavol.pdf
    • http://lnstagramsupportlives.com/teziripurapowawoxuve8q03g.pdf
    • https://pofogixalozog.weebly.com/uploads/1/3/5/3/135346485/758b74.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_0c696b9603d849fc8f64515d671b5fe3.pdf?index=true
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_394e33a1c2194cac8a5f11f3de79eb6d.pdf?index=true
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_6c25da8fe90a4d20bc6f35d620407b52.pdf?index=true
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_c2e35a800f834456a90e5f60680fd684.pdf?index=true
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_2ca68932ae8f4096a770bcd0fd3416ff.pdf?index=true
    • https://6731adf0-0bfb-4e29-9024-dbf0b6c78d19.filesusr.com/ugd/163ed7_3b215435d1bf406988bfefcb3446bec7.pdf?index=true
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_fc0a0f95ad534fbca9337cb79b2836a6.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e603.bin
3afcf6f6e016562806c080f25c59964654a06c8d4b3d7167dcd313e4ebf69b98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 5516 bytes
font_01_sfnt_off0000f8ce.bin
0781c83ca689f4dd11a0b1b7c2172ba4eecca0a6b81dd51b60072ef7d3b791c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 10084 bytes

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