Malicious PDF — malware analysis report

Static analysis result for SHA-256 439d16f56851d28c…

MALICIOUS

PDF

74.9 KB Created: 2021-02-17 20:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 523c18e108d88c7562f0b247b071d674 SHA-1: 8f63e30592f832d4d8b504e0f4510a7846dfd825 SHA-256: 439d16f56851d28c6013b59e23bb9d2d85d56ed42cc1dc995ca18c0496cc2ec6
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though partially obfuscated, references "5 themes of geography questions and answers", likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=5+themes+of+geography+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/tukawezezo/PgcGhhv/55799455519.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447252/normal_5fe2ce71d8abb.pdfIn PDF document text
    • https://fogisavelubid.weebly.com/uploads/1/3/5/2/135299906/717251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475571/normal_602317897c257.pdfIn PDF document text
    • http://igbusinessabouthelp.com/68075959279jss41.pdfIn PDF document text
    • http://everydayy.fun/kuxilesuuhkcy.pdfIn PDF document text
    • http://atlas-copco.su/19763548594n2buz.pdfIn PDF document text
    • https://vegirizekor.weebly.com/uploads/1/3/1/4/131407876/4477755.pdfIn PDF document text
    • https://vogoniboka.weebly.com/uploads/1/3/1/0/131070279/9219519.pdfIn PDF document text
    • https://petekebinipaz.weebly.com/uploads/1/3/5/3/135395272/vabuded-lujopa-mojurudeted.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487625/normal_6003393777471.pdfIn PDF document text
    • https://cdn.sqhk.co/neratimo/gj62geZ/95649104674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471235/normal_602544898001b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://potopaf.epizy.com/2334858087.pdfIn PDF document text
    • http://gekazez.epizy.com/chauvet_obey_40_d-_fi_manual.pdfIn PDF document text
    • http://guwebazumojopa.epizy.com/pizorezuluwepinosed.pdfIn PDF document text
    • http://posugez.epizy.com/buccal_smear_examination.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_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 5772 bytes
SHA-256: a38d05c780a98b98d9621b778aacab3401e599f813d8667fcfa1fd3cdc305923
font_01_sfnt_off0000faa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA5 10404 bytes
SHA-256: 22c32261a04b5fccc0dd1ade4929bb28f12e9db9cbab38f82507f7fd021aef73

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