Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e781b6fb519cb48…

MALICIOUS

PDF

91.9 KB Created: 2021-03-01 08:46:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 658cfde3f6dbcc94b112976a88e8a74f SHA-1: 953c3b29fbf1ba98dd227979b703fb52fae51f35 SHA-256: 2e781b6fb519cb48349c18a8a159ade9754e4c2930bc8bb88e0c8348e5643191
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to a malicious domain, identified by multiple heuristics as a malicious redirector and link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing lure or download a second-stage payload. No scripts were extracted, but the primary attack vector appears to be the malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=watch+twilight+saga+eclipse+movie+online+in+hindi In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_6024fb3d9dad0.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/JdhjgiH/pamuvabojisazakitamil.pdfIn PDF document text
    • http://wildboost.club/waterboss_700_installationdfnef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485703/normal_5fe36983797e2.pdfIn PDF document text
    • http://nout-sale.site/what_is_the_congruent_complements_theorem_meanwwtt7.pdfIn PDF document text
    • http://clipshd.design/394093663161wf2j.pdfIn PDF document text
    • https://retetozatinum.weebly.com/uploads/1/3/0/7/130775023/napijejaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404112/normal_601218e75cdc3.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/eMjfZsp/97173244169.pdfIn PDF document text
    • http://zzzmmmmejjj.space/834863200123qmfs.pdfIn PDF document text
    • https://kumeboxisadinur.weebly.com/uploads/1/3/4/6/134684257/rexazuledowamuw_midebugimujif_buripar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_5fd6520c15f2e.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/hg10JpJ/midge_fly_larvae_in_drinking_water.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449001/normal_5fd83e1cac054.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484635/normal_5fffb3da7a5ef.pdfIn PDF document text
    • https://puzaloraren.weebly.com/uploads/1/3/4/5/134510283/8293073.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459034/normal_5fdf4739a6d69.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/ac7ece800892cdb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460946/normal_5ff938a75ae2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455669/normal_601d992975a04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE7 5344 bytes
SHA-256: 76e66caa135b7f317132721bd4f5284aa5d9959e3f1c7c2c442ec920a0404c45
font_01_sfnt_off00012f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0B 10692 bytes
SHA-256: a8ce6e07035830b8b610c69a9d8d802a6075e3679dc989a6f17de1082c811426
font_02_sfnt_off000153b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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