Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fd31242963a727…

MALICIOUS

PDF

120.0 KB Created: 2021-06-03 00:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7f7280bb15800d5f303938754acc35da SHA-1: 54d05e3804b1a582d0225ffec81481189d296065 SHA-256: 82fd31242963a727f190de1872357f054f887c9ece6946be04a72cf0fc700173
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan distribution vehicle. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs point towards techniques used to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://queure.ru/pbw?utm_term=what+is+the+theme+of+the+adventures+of+ulysses PDF link annotation
    • https://gikanirirexenad.weebly.com/uploads/1/3/0/7/130776133/7092598218.pdfIn PDF document text
    • https://xorozatu.weebly.com/uploads/1/3/4/4/134461248/8166358.pdfIn PDF document text
    • https://vesokawewewavi.weebly.com/uploads/1/3/1/3/131382886/b499775e4c.pdfIn PDF document text
    • https://kaxizaro.weebly.com/uploads/1/3/5/3/135349404/pafidaxifukolutegama.pdfIn PDF document text
    • https://mujugoseboli.weebly.com/uploads/1/3/4/3/134312554/zaxanisiweguk.pdfIn PDF document text
    • https://rizogedimawe.weebly.com/uploads/1/3/0/7/130739598/wozusekenu-zajabawojabifo-tesifigaki-vugasukofixokib.pdfIn PDF document text
    • https://padixegidenu.weebly.com/uploads/1/3/1/1/131164435/motusikugi.pdfIn PDF document text
    • https://zunurevupuvofas.weebly.com/uploads/1/3/1/4/131438471/2607771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495526/normal_6050e0e5400b4.pdfIn PDF document text
    • https://jenifamizoj.weebly.com/uploads/1/3/5/3/135319667/707477.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/3605683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_605d20462044b.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4410674/normal_60b534d0a2861.pdfIn PDF document text
    • https://gaxiworet.weebly.com/uploads/1/3/1/4/131408942/warexapuriman-munikazekib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495262/normal_602bf6209767f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417648/normal_60115a4608401.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/542f23b0-7d04-4bbd-97af-685fba0f4f01/34932142164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4979d501-2e5b-4b81-aa49-352782efd6b6/16114829734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb81e608-4a40-4a10-b939-7d65d597af98/42081758725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e28a1b9a-7d47-4773-85e2-5c35f37765ec/dotabadejubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/726d130c-447a-4a1b-910f-50a49e9f12ac/rikij.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_off000197f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197F7 5324 bytes
SHA-256: 2ee98050af5b654b89cd1d441fb1848585aed345fbb98be29630f697c767e2e8
font_01_sfnt_off0001a9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9FB 11680 bytes
SHA-256: f767fe2d88f0d18d1894d6046e199805114131c9d26235a8d836d7129a78232c