Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af29f8693bb32cd…

MALICIOUS

PDF

74.8 KB Created: 2021-02-22 06:15:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 16b359470b97dce39e3c242093f7e7ab SHA-1: 9802a13b037460927ad1d101e5c71547db60b478 SHA-256: 3af29f8693bb32cd6b152418046113e51559db2073185bf887755fc86fae45ac
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous links, including one pointing to a known malicious redirector, and presents a deceptive 'download' lure. The embedded content, though heavily obfuscated, suggests an attempt to trick users into downloading potentially harmful files, aligning with phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=java+games+apk+for+android In PDF document text
    • https://rimenedefogifu.weebly.com/uploads/1/3/4/4/134466040/xevej_doketudup_rexefedoxipu.pdfIn PDF document text
    • http://xapakemulu.22web.org/52826283923.pdfIn PDF document text
    • https://vabisoxapulaji.weebly.com/uploads/1/3/4/4/134444495/vifovidudifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480728/normal_5fd1e043e9ff8.pdfIn PDF document text
    • https://niberijiv.weebly.com/uploads/1/3/4/0/134017170/povepudixex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_602c78deabe98.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/ec68b8c9c874469.pdfIn PDF document text
    • https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/2663284.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470696/normal_5fc586f161ec0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449178/normal_5fff7ff3ca1de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tejizikadojuni.epizy.com/beginner_piano_books.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/bibliographic_citation_in_mla_format.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/physical_properties_of_matter_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/acalasia_tratamiento_nutricional.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/jitejikoji.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/93467250486.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_off0000e6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 5444 bytes
SHA-256: 49b5ad409e91d688da6ef2394bbe820bd19df8cb625ba485d114c9732c8e214a
font_01_sfnt_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 10736 bytes
SHA-256: 8494345ea6bce504f2d3b44a9e25991324252474b0ee61b2beb41bb6ac9ec11e

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