Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bb0328802c90e5…

MALICIOUS

PDF

93.0 KB Created: 2021-05-20 02:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 240cd189f2aa22a3ae53577cf7c05a41 SHA-1: 278297ffb6948c0577a0792d6b425a16b10a4927 SHA-256: a4bb0328802c90e55d6d976521da26220102c7c1b9a851412994233c0d23f244
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains like 'weebly.com', suggesting a link farm or SEO manipulation tactic. The embedded URL 'https://kuzutuzo.ru/strik?utm_term=survival+of+the+fittest+natural+selection+adaptation' further supports this, as it appears to be a redirector. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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 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://kuzutuzo.ru/strik?utm_term=survival+of+the+fittest+natural+selection+adaptation PDF link annotation
    • https://losarofimet.weebly.com/uploads/1/3/1/3/131384333/zozimafaxapote-sumulonu-takizuwivas-disonuful.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_60469670517f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_601eea389fe4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487888/normal_6028606b23ed4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_6068e96b9bfe3.pdfIn PDF document text
    • https://rozutawupev.weebly.com/uploads/1/3/2/6/132695629/gatuna-tiweparidub-pupep.pdfIn PDF document text
    • https://litufefanim.weebly.com/uploads/1/3/4/9/134901191/f4979411.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476765/normal_5fcf2c7256bb3.pdfIn PDF document text
    • https://xibimitavidin.weebly.com/uploads/1/3/1/8/131871740/1940263.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449178/normal_60095c70e9423.pdfIn PDF document text
    • https://nobixerevogug.weebly.com/uploads/1/3/4/4/134481004/d4182a061.pdfIn PDF document text
    • https://peranuzepaz.weebly.com/uploads/1/3/4/4/134459051/silij_sibenofemoko_malixovaxi_fadokobajejeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426080/normal_604af9784c461.pdfIn PDF document text
    • https://robavefozaxun.weebly.com/uploads/1/3/4/3/134379548/visewajekupomor.pdfIn PDF document text
    • https://gumelajijepepa.weebly.com/uploads/1/3/4/6/134639918/2637375.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415525/normal_6001663852178.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402933/normal_5ff684f270df4.pdfIn PDF document text
    • https://fidovasunub.weebly.com/uploads/1/3/0/8/130815093/duxelujuzasifekuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_60380bdf7b650.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459174/normal_6005432bcd165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473379/normal_606ae4400bef9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418972/normal_5fceedb6e4ebf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488569/normal_6008d6cbd335b.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
    • https://uploads.strikinglycdn.com/files/0986dc6d-0b5a-4cfc-af6f-9765c4e0d183/is_br-_a_lewis_base.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde751f4-15dd-44d0-aa39-087249f3c20e/49577494158.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC3 5288 bytes
SHA-256: 06767af90dae616987d6d277d4ed4151aef5a26cb0ab1e22c3cd283eef7dd207
font_01_sfnt_off000131b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B6 11504 bytes
SHA-256: 996af521520baf0d277d7a475ce81fd38004c443718d000cddb07a9d2ead9a6a
font_02_sfnt_off000157ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157EE 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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