Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24488a1f92ea4fa…

MALICIOUS

PDF

85.4 KB Created: 2021-03-30 15:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b9e9f1e22701ffff5ec0425c7d10598c SHA-1: 7910ff33cb47e7c469ca8bdddf155ef0a78bdc66 SHA-256: d24488a1f92ea4fa53811dd6def5da2cb301bc3bdc1b0d40531600201a677178
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to what appears to be an SEO link farm designed to distribute malicious PDFs. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK indicate a phishing lure. The presence of ClamAV detection and ML classification further supports its malicious nature. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://nipisod.ru/strik?utm_term=percy+jackson+heroes+of+olympus+books PDF link annotation
    • https://vigodozoxofi.weebly.com/uploads/1/3/4/5/134599787/5966818.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477162/normal_600290791476c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452173/normal_600c2146e973f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_6026b0a8c1d30.pdfIn PDF document text
    • https://gegiritofizupog.weebly.com/uploads/1/3/4/6/134644009/vinunagolosuba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481671/normal_600f00ee03c30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415782/normal_6061eefe2b16c.pdfIn PDF document text
    • https://nalufubuxozukex.weebly.com/uploads/1/3/4/4/134479837/6316295.pdfIn PDF document text
    • https://dujisiseruw.weebly.com/uploads/1/3/0/7/130776106/galuj_kijurid_tuputu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384164/normal_6048a2f930fe1.pdfIn PDF document text
    • https://zoninezazazi.weebly.com/uploads/1/3/1/0/131070362/poramigezuvax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488815/normal_605d6d9e85f9a.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://s3.amazonaws.com/zodawanuror/desorovaturorulexofug.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/audio_video_cutter_and_joiner.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/sujeriz.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/gimazufotesumerubujuxipot.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/what_is_the_structure_of_a_formal_report.pdfIn PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_279e09a36a2e4fbf87d539146b1c32ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiduro/16111541509.pdfIn PDF document text
    • https://c9107794-7b31-4e5c-84de-5db174abdfaa.filesusr.com/ugd/aabf5f_e515534cf88c47079338234244552899.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/bawolubonixixo.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/deritodisivosejarife.pdfIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_a607ad2a9d524afd932d49808468f815.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 5392 bytes
SHA-256: 6da57d94833f83f8b04d383bc5dd86c4e11386f25e9952e40e4696c105513749
font_01_sfnt_off00011551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11551 11092 bytes
SHA-256: 020953f0f4c0a7845fe62665e7a53263c69c80d300bf9c155d477911969371bb
font_02_sfnt_off00013b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e