Malicious PDF — malware analysis report

Static analysis result for SHA-256 db84ffb232dc7c62…

MALICIOUS

PDF

73.3 KB Created: 2021-04-06 20:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc0c3d24e879cb91dc7a406401cb126b SHA-1: ecb0cd6e62cb51a5c35ec69cbafcdfe25727bdd6 SHA-256: db84ffb232dc7c6229ead85275714b8a968bfe2b282f78a16b578275fe6e2bb2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, suggesting it is part of a link farm designed to direct users to potentially harmful websites, with one primary URL being https://pelibifir.ru/123?utm_term=letter+of+application+template+uk. The document body, though heavily obfuscated, suggests a lure related to application templates.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/123?utm_term=letter+of+application+template+uk
    • https://felupujefokedab.weebly.com/uploads/1/3/4/6/134621420/4e3dd8e.pdf
    • https://todegebonuvakef.weebly.com/uploads/1/3/1/6/131606144/3d6586.pdf
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/984389.pdf
    • https://cdn.sqhk.co/guwaloxipete/hhf6EJL/airplane_for_sale_by_owner.pdf
    • https://jawetixadal.weebly.com/uploads/1/3/1/6/131606755/pejozedofavefarawo.pdf
    • https://tudaluvakagovax.weebly.com/uploads/1/3/4/6/134614365/7bc91152ad1b76.pdf
    • https://cdn.sqhk.co/nupepewomaxu/azBEeje/ultimate_fishing_simulator_ps4_amazon.pdf
    • https://cdn.sqhk.co/bogulevim/22gehve/91901698520.pdf
    • https://cdn.sqhk.co/gebemiwisero/AghUjdz/tabletop_fireplace_indoor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_133bdc056f1a4e95a16836e03cc9be3e.pdf?index=true
    • https://dce09894-55e7-49e1-9c43-b94069c58f23.filesusr.com/ugd/11ae40_a7089b07a9da4a629e30c68748ad8a01.pdf?index=true
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_57452fc64c224f2cb4f7eb2628e763eb.pdf?index=true
    • https://s3.amazonaws.com/womirofop/83508100181.pdf
    • https://s3.amazonaws.com/divexikav/shut_up_flower_boy_band_songs.pdf
    • https://s3.amazonaws.com/nilafafakem/taurus_pt111_g2_green_laser.pdf
    • https://2108ee29-f41f-4224-afb3-8e24ca2f7712.filesusr.com/ugd/279473_a30477125d4a4c18a7b022806706ef81.pdf?index=true
    • https://s3.amazonaws.com/gekixadonuru/how_to_stop_using_run_on_sentences.pdf
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_ad1bde5cebb64ab8a81565c5a3e9fe8a.pdf?index=true
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_9707d6f9bf404dbaaa1c2bf36b75fb9e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e39b.bin
15e1beab941932e6c3f85f71c79bc1fe277ac70fc4b342be46a39baa6f1f9fd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 4988 bytes
font_01_sfnt_off0000f486.bin
3c23c58f0e73844eb88bcfa671a5ccd894c73f0bd2d8263cbec93a295ca789e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 10444 bytes

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