Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3daeda34bfdc1e2…

MALICIOUS

PDF

77.2 KB Created: 2021-02-23 09:07:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 19931c7b1ec64718a2a0ae656786de67 SHA-1: 39ead31cc9f556fab1b821fd2e65dd2285e6e75a SHA-256: d3daeda34bfdc1e22b3702a40d1e8491a6a63f5fccd5dd2918704d252af6b98f
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to an 'Openfoam 4.1 manual'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=openfoam+4.1+manual PDF link annotation
    • http://romeoplanet.club/fry_sight_word_assessment_sheetbqvex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487409/normal_60027a3ae4505.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470980/normal_5fcb7d39869f5.pdfIn PDF document text
    • http://flowerport.market/dummy_data_excel_sheetul7o4.pdfIn PDF document text
    • https://vajubepodeno.weebly.com/uploads/1/3/0/7/130776779/nipami.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454168/normal_5fe3e95083cc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422628/normal_5fc8e298ebf4f.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/3724130.pdfIn PDF document text
    • http://predouche.xyz/30089165853gbk9g.pdfIn PDF document text
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/2358235.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/pewebopufupe/anthony_robbins_personal_power_ii_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/verizon_remote_volume_not_working.pdfIn PDF document text
    • http://puwagof.rf.gd/12788661659.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/66531986437.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_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 4972 bytes
SHA-256: bde71cc52b4534cbc13357b5e02c20943cf825c01716409bf30f6c9634b8b217
font_01_sfnt_off00010297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10297 11360 bytes
SHA-256: edfb39083b1b9fc777de6cd5b5b6faad83262a48af229fdaad6824ee60ff96ea

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