Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1002d7d07776be…

MALICIOUS

PDF

78.5 KB Created: 2021-02-21 07:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c06b6d1590c39048e22d0a47190cbc53 SHA-1: b5f444d443b9ae8410e96052d118d38c4951ba58 SHA-256: af1002d7d07776be256f2158189ef93722c4db703a51a73c8b38659b8a9d765a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF_SEO_LINK_FARM heuristic, suggesting an attempt to drive traffic to malicious sites. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs indicates a likely attempt to redirect users to potentially harmful content, possibly for phishing or malware distribution.

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://baarspo.ru/strik?utm_term=2016+lexus+rx+350+f+sport+for+sale+in+nigeria PDF link annotation
    • https://cdn.sqhk.co/rapovebakeb/aPnibge/temple_run_game_download_apk_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/poxufape/ibhfjcr/osu_duo_mobile_new_phone.pdfIn PDF document text
    • https://rapinawenag.weebly.com/uploads/1/3/0/9/130969945/ae37fa17d80528.pdfIn PDF document text
    • http://bilkan.fun/blackberry_bold_9900_firmware_7._1uhs7n.pdfIn PDF document text
    • https://nogikukejigili.weebly.com/uploads/1/3/0/8/130873965/rozorepurododa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/castle_on_a_cloud_karaoke_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/39442841823.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/latudeku.pdfIn PDF document text
    • http://netifikapiwi.epizy.com/tasoxujevetokefavabipenaw.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/12945465577.pdfIn PDF document text
    • http://punirasum.rf.gd/perfectly_inelastic_collision_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/block_calls_on_my_android.pdfIn PDF document text
    • http://pudilulajetelu.rf.gd/rurirumuvugajakukukal.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 5808 bytes
SHA-256: 9d9c37d0eceaedf77fe0831f3573d5b5682f9d9c5590687b11b93fe29fc5bd79
font_01_sfnt_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 11436 bytes
SHA-256: f401f245872ca9996f4e101562989082eab1e9fea6373474f7b92468d20f7a81
font_02_sfnt_off0001181c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181C 16064 bytes
SHA-256: be8c4ba19c2b85b87f0bd042de6934090ff3aaf7d05a2a07374ae912900ef4d9

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