Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa114e172814c7c1…

MALICIOUS

PDF

72.8 KB Created: 2021-02-24 15:01:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 444d3417690bbe30e3395bea84d7b654 SHA-1: 76e51768e1f798ebfe61f0827786c667cab42e8a SHA-256: fa114e172814c7c17e82bbe545414dad1490a4727811f6496285379ac0c433fb
186 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or conduct phishing. The document body, though heavily obfuscated, appears to reference a sewing machine, likely a lure to entice users to click on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=brother+sewing+and+quilting+machine+cs6000i+60+built-in+stitches PDF link annotation
    • http://instacopyrighthelpteam.com/building_maintenance_schedule_template_free_downloadvlccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_601c5b5b34c24.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/1766630.pdfIn PDF document text
    • http://azalea.store/path_of_empowerment_barbara_marciniakmqal4.pdfIn PDF document text
    • http://feporerapupanun.iblogger.org/vans_platform_sneakers_journeys.pdfIn PDF document text
    • http://vikutoxe.iblogger.org/how_to_simplify_rational_expressions_with_fractions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449968/normal_5fd24ff532ac2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496391/normal_601915e44061c.pdfIn PDF document text
    • http://lngcliente.com/mafawupojotiva6serj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472186/normal_6008bafd3505a.pdfIn PDF document text
    • http://spindlndou.space/975688933ou3n1.pdfIn PDF document text
    • https://pegujerexiwusi.weebly.com/uploads/1/3/0/8/130814209/sibofejalusaximuvugu.pdfIn PDF document text
    • http://gonuzigodu.iblogger.org/70413530581.pdfIn PDF document text
    • http://profer-opt.ru/junorakikevefebewirhwl4.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/goxupejuxisesebrmwbi.pdfIn PDF document text
    • http://samettemiz.xyz/903848769723kjjv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417313/normal_601b39a068386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381095/normal_5fd936a791137.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://najubizep.epizy.com/87535648263.pdfIn PDF document text
    • http://gununusaw.epizy.com/diehard_platinum_battery_charger_1150.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD17 6088 bytes
SHA-256: e12a4aa451031baf4f857f135646bdba36728b9187e48b9801a12939b7a491ad
font_01_sfnt_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 10504 bytes
SHA-256: 4e53751ced5245ca2f1134668c059c8a0382a0f3718a021620cda88fa4f0fbd4

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