Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68495cb4c75518d…

MALICIOUS

PDF

75.2 KB Created: 2021-05-29 19:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 036609b0d9517b8d22a0a529cd5d5fa7 SHA-1: 22182d7d7dae35e4bcf9fde935665a41f528259b SHA-256: c68495cb4c75518d8fb2567fbea2ad9fe80a868b96ae53fcee1788d7759cdf95
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

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.
  • 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://midufefew.ru/strik?utm_term=what+questions+are+on+the+alabama+permit+test PDF link annotation
    • https://loxufoxoxow.weebly.com/uploads/1/3/5/9/135982175/jofelavurof-gavobitap-bamiduxufubi.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/wagaxe.pdfIn PDF document text
    • https://gapudozesaneg.weebly.com/uploads/1/3/4/5/134525911/6437285.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/18848.pdfIn PDF document text
    • https://gozenanojive.weebly.com/uploads/1/3/4/7/134747079/4157866.pdfIn PDF document text
    • https://monoxoni.weebly.com/uploads/1/3/0/7/130738852/garofekuvora-bibezusowata-jarov-dugepu.pdfIn PDF document text
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/rogikezotelid.pdfIn PDF document text
    • https://rafafokisot.weebly.com/uploads/1/3/4/7/134738004/pufabivekaweru.pdfIn PDF document text
    • https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/9772806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464078/normal_60302a6a0961f.pdfIn PDF document text
    • https://fedonofawok.weebly.com/uploads/1/3/4/8/134881994/7f0558cc54.pdfIn PDF document text
    • https://famudixapakowep.weebly.com/uploads/1/3/4/8/134855218/xupitotowalade.pdfIn PDF document text
    • https://duzopuxezofuj.weebly.com/uploads/1/3/1/3/131382696/zexamorugefaninubiro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490752/normal_605283bc283d2.pdfIn PDF document text
    • https://vejuxafesopekub.weebly.com/uploads/1/3/6/0/136010302/a2626af05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495050/normal_604ad225b6726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450428/normal_6064fde2c57d7.pdfIn PDF document text
    • https://wufewevaso.weebly.com/uploads/1/3/1/4/131453291/faguli.pdfIn PDF document text
    • https://lapumutugafi.weebly.com/uploads/1/3/4/6/134601317/8146934.pdfIn PDF document text
    • https://zevamomarage.weebly.com/uploads/1/3/4/6/134611313/devara.pdfIn PDF document text
    • https://vidufatow.weebly.com/uploads/1/3/1/4/131438098/e63cd8b586a.pdfIn PDF document text
    • https://bodadesoka.weebly.com/uploads/1/3/4/2/134234706/vagejog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 5336 bytes
SHA-256: 8225de8ca8b9d63161844bb1d2a586fb3bbf8d3ac309dd456bd9aae098e10962
font_01_sfnt_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 11152 bytes
SHA-256: bfb512b2b9c48891c85912275ab82a3d2db570aa044113728962e48eb092aa63