Malicious PDF — malware analysis report

Static analysis result for SHA-256 64685149b77d9585…

MALICIOUS

PDF

82.8 KB Created: 2021-03-13 23:55:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ceab665009eed14371fbd84afd88b668 SHA-1: 250c0a73bf7f7e1932661b10aac213242caa46a5 SHA-256: 64685149b77d9585d980ddcb57057866775e7710233a115a64675f9f274d0661
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal a significant number of external links, suggesting a link farm or SEO spamming operation. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=best+baofeng+to+buy PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464056/normal_5ffc98034b96a.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/96_polaris_sportsman_400_for_sale.pdfIn PDF document text
    • https://todurudivi.weebly.com/uploads/1/3/4/3/134344361/gifopolid.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/bitepujisek.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/fur_elise_piano_sheet_music_for_beginners_with_letters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449600/normal_5fd65bc29b448.pdfIn PDF document text
    • https://vijibasotaxeja.weebly.com/uploads/1/3/5/9/135990507/kimopetogud-kimevumakisula.pdfIn PDF document text
    • https://logifuvixejexa.weebly.com/uploads/1/3/6/0/136019385/345487.pdfIn PDF document text
    • http://birebap.scienceontheweb.net/puvapenomojedewuxi.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/92887803307.pdfIn PDF document text
    • http://sibogufurab.medianewsonline.com/tobasopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410441/normal_600d03aac840c.pdfIn PDF document text
    • https://cdn.sqhk.co/vedukosamo/jgEibVw/dilubezisesirexe.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/gih6hf7/2013_super_snake_mustang_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/hdlje7q/gawabiwoxivini.pdfIn PDF document text
    • https://nofuzibid.weebly.com/uploads/1/3/1/4/131453406/d5df22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_ed8432fe47e2437ab93f159024cbd68d.pdf?index=trueIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_b6e57f8faa37497a8d853a09bc31c0f9.pdf?index=trueIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_838d7527abd948ffb3ba4e1f77cb75cc.pdf?index=trueIn PDF document text
    • https://db38eef3-7d65-43a4-badd-ba39ed7d9417.filesusr.com/ugd/bd2483_bd1a3e41db63467f93e1f9182c0c9283.pdf?index=trueIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_fcc250f0b7304b3a81f92dfceaf7515b.pdf?index=trueIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/grid_dnd_5e_google_drive.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_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 5100 bytes
SHA-256: aa5e705e15414b0d99862dd808333419584495322d0a370281d3b605067fc42e
font_01_sfnt_off00011575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11575 11436 bytes
SHA-256: 0bff4ade776b8935bc1e23adb8d317ca2bb6765eb4759a96f4b0d096bc82e1de