Malicious PDF — malware analysis report

Static analysis result for SHA-256 bccc83c3c41080b2…

MALICIOUS

PDF

95.4 KB Created: 2021-02-12 05:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 51800ce44f59159683c0de316d6405e5 SHA-1: d824485a61f9cf442a2c85df823b231ea12a67cb SHA-256: bccc83c3c41080b2450ce29f4b3fa800015d36fe571c1cf646bace9ccc2db6f2
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDF files, indicative of a link farm or SEO abuse tactic. The presence of ClamAV detection and ML flagging strongly suggests malicious intent. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a keyword suggesting a download lure, aligning with the PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=india+kml+file+download PDF link annotation
    • https://zugufirit.weebly.com/uploads/1/3/1/1/131163535/xerabusojitake_miferefovu_pegadugode.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/zatunetexoragabaxav.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoxezoza/icF8icZ/pojolaxos.pdfIn PDF document text
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/01bb1cfa.pdfIn PDF document text
    • https://dofigova.weebly.com/uploads/1/3/0/8/130813881/6fbf2dd597.pdfIn PDF document text
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/ditexoxodavofem.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/ggjukjb/photo_editing_software_free_download.pdfIn PDF document text
    • https://badosesidexezub.weebly.com/uploads/1/3/0/8/130874160/8ded370b925b.pdfIn PDF document text
    • https://napajudiweji.weebly.com/uploads/1/3/4/3/134316113/5344659.pdfIn PDF document text
    • https://cdn.sqhk.co/bidubuwawi/jhIihe0/mebezoridunuf.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/chbkig8/luvowopawolitowowibapu.pdfIn PDF document text
    • https://bamebifubakuta.weebly.com/uploads/1/3/1/4/131408159/terolupu.pdfIn PDF document text
    • https://rawekawus.weebly.com/uploads/1/3/4/4/134467784/mufotitog.pdfIn PDF document text
    • https://zenamuvevabun.weebly.com/uploads/1/3/1/4/131453902/84f90.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/jemazejodep/89953922213.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/jukufuveposumavuvozef.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/grand_chase_dimensional_chaser_amy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/22279915109.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/nulapifiraru.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_off00012d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D62 4872 bytes
SHA-256: 01bd6474d60da42bc9a284315de6783de8da76753fd31cc05806b9827d48b160
font_01_sfnt_off00013e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E02 16272 bytes
SHA-256: dd6541655d39eb8ecae2e897c6f4cbf14b228f5f186d2ff6a9f3a141acea7976

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