Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8254facddbce3e…

MALICIOUS

PDF

74.9 KB Created: 2021-03-19 11:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7dda4969b5ff623a1d3a7af9693242c5 SHA-1: 2725944a00a3add0d9325b3828559a5e2e3a37c4 SHA-256: fd8254facddbce3e4fc000ea5667d68073fe515efbc063f7f150c7ff28a921c1
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to a redirector URL, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the idea of a web-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=what+does+the+skin+of+your+teeth+mean PDF link annotation
    • https://cdn.sqhk.co/zimopaji/jievjhr/pj_masks_hero_academy_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529977/normal_60380f82a8d2c.pdfIn PDF document text
    • https://cdn.sqhk.co/masemojenud/davhaja/53794540442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415754/normal_6026dd5930d4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476453/normal_60253cd439fe3.pdfIn PDF document text
    • https://cdn.sqhk.co/tovasodoj/hgdByJb/wulinugotiwixorogatabena.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/iBjgicL/58725027168.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/okjgvwV/19537331888.pdfIn PDF document text
    • https://cdn.sqhk.co/bowevuva/jYihcgi/winchester_defender_1300_review.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/zPnNib4/water_pipes_knocking_fix.pdfIn PDF document text
    • https://cdn.sqhk.co/fapiwejagiz/xijDjif/scene_girl_hair.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/jiihajh/5426376436.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/kokesatodixon/61522319173.pdfIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_966f38de80874a07b831acab092d4c00.pdf?index=trueIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_d78555b6470e4b929438dd1ae1fca66f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/52082559972.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/animasi_lucu_untuk_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/bobcat_requirements_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/88045516460.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/pogo_tv_mr_bean_video.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/compound_subject_worksheet_3rd_grade.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_off0000e90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90D 5292 bytes
SHA-256: 0dfef4f30b26e1ccf9fc29fa28ce7d9d3b054571ebb7f4ce07cb9d177e6c9bba
font_01_sfnt_off0000fafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFA 10212 bytes
SHA-256: 398737a6b40bda5417e8589a46042c726631e6eaac7b8b0a5829c0e99fba0c61

Open this report in the interactive analyzer, or submit your own file for analysis.