Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d9c81c968071bc…

MALICIOUS

PDF

71.1 KB Created: 2020-11-17 17:40:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6ec34b59b0b2f9ab3335f177975821c4 SHA-1: 96e53344b447e1bf15d233bc98b8f5d959264850 SHA-256: 71d9c81c968071bc2213fa920326508882b5726cc2db1e05bf5c725b588ef5be
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://trafffe.ru/strik?utm_term=japanese+car+auction+sheet+verification+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5f9c1178adb0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f86fe97257d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472753/normal_5fa6212ce981d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374686/normal_5f894aff51652.pdfIn PDF document text
    • https://gikusevenax.weebly.com/uploads/1/3/4/5/134529244/rozisigeloger.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/6628f6f7fc76.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/7959581.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/sakibugimakizej.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/a3d365f6-027f-456a-9b4f-2c935fcab63c/60025834569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/905dd8dd-01dc-44ed-b507-d0ed8087e43f/ch_sound_worksheets_for_preschool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37df84bf-fec6-4cbe-a97c-709ce70b6b14/lapokugil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64795639-a370-407e-8442-b813160ce775/72149430860.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/96758504095.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_off0000cc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC11 5000 bytes
SHA-256: ff1572d8835b8fe4a613ee90bba13242d9adf1a996488167bbc078f28c7d60d2
font_01_sfnt_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 10656 bytes
SHA-256: df0130692635049953bf32bd241adb529c3c0f586ae38f603e801ff3f5e86073
font_02_sfnt_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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