Malicious PDF — malware analysis report

Static analysis result for SHA-256 641476a16523d6ff…

MALICIOUS

PDF

74.8 KB Created: 2021-03-20 01:16:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 630a0cca1e790e9bea877cdfd3cfbfa6 SHA-1: 2dd985b16b22e8d95235e5686768fab57359c670 SHA-256: 641476a16523d6ff8abb860d74131da50c379def9ea8d4953e516426d5209399
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating it likely serves as a phishing lure or malware distribution vector. The presence of a large number of embedded links, including one pointing to known malicious redirector infrastructure, strongly suggests an attempt to direct users to harmful sites. While no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious intent to exploit users through deceptive redirection.

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
  • 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 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.
  • 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=modo+de+produccion+economia+primitiva In PDF document text
    • https://xegokefizu.weebly.com/uploads/1/3/5/3/135323464/fugaxisige.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/fIhgcjh/anime_doll_maker_games_free_online.pdfIn PDF document text
    • https://vigedinolig.weebly.com/uploads/1/3/1/3/131380992/6396602.pdfIn PDF document text
    • https://ranitezal.weebly.com/uploads/1/3/1/4/131438109/tafuwabijiv.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/ifunNgh/hit_and_run_tractor_trailer_accident.pdfIn PDF document text
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/6d5a039a283e.pdfIn PDF document text
    • https://sexozubo.weebly.com/uploads/1/3/0/7/130740033/1ab92042cf.pdfIn PDF document text
    • https://cdn.sqhk.co/zozimevoket/jfaJidS/cake_makers_near_me_prices.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_0b9f3f85123247808c4302d1cdf0929b.pdf?index=trueIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_465514c87e3c436983f0841508a2c871.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/solonebosop/nejugerosaxagex.pdfIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_d73e1469a5fb49a293052b0326a4f46d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/add_butterknife_to_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/65835989299.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/piriformis_syndrome_symptoms_runners.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/subordinate_clause_worksheet_ks2.pdfIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_183f8d665ed4498297dab53e77145aaa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sixolose/91695395690.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_6d083d63f7784d7793971a165b7e055c.pdf?index=trueIn 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_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 5072 bytes
SHA-256: 2c9dcb7d52308a7314bc62edb973544972ff49c38abf750b4653c7ce38c9de85
font_01_sfnt_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 11012 bytes
SHA-256: 147bf333ae302865467f887a4ad49e594c10cc0b601db54b0815d2a28dae668b

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