Malicious PDF — malware analysis report

Static analysis result for SHA-256 1128fcad3a9590c8…

MALICIOUS

PDF

72.0 KB Created: 2020-11-14 07:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 22f3a0e647a5759bee782c97bc7be6c6 SHA-1: b95a61325723ef0d3a54fcfa4616fa5124f7123f SHA-256: 1128fcad3a9590c820d65c16b1db1bf29d8b3be4daa0f1482660989f5bc65a03
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs are likely used to redirect users to malicious content or phishing sites.

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://trafffi.ru/123?utm_term=terraria+how+to+respawn+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5fa48d2b25b13.pdfIn PDF document text
    • https://negiwonilelif.weebly.com/uploads/1/3/4/5/134583179/kevitodabelidobogek.pdfIn PDF document text
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/sitosukiwutile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5f9771553ffa2.pdfIn PDF document text
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/xemuwuxevakomaj-vefajak-zeraki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416805/normal_5fa0289ba0df3.pdfIn PDF document text
    • https://duxataravur.weebly.com/uploads/1/3/4/0/134017775/8361788.pdfIn PDF document text
    • https://xovatikawe.weebly.com/uploads/1/3/4/7/134726086/wafaribikova-xubotikomabana-zitanaxedaga-wukagogajuv.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3808383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5f981bffdc81b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370080/normal_5fa51ab1ad512.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/f15c6ffc-e879-44d7-b155-b654789343cc/91365664914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ab1400-5b76-4381-9cc4-069ae44575d3/writing_a_letter_of_resignation_for_nurses.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_off0000dcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD3 5232 bytes
SHA-256: 06c34bf13d6fba396786b69c973a47eb43a43c648c4c65924bc7289092c9b06e
font_01_sfnt_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 10848 bytes
SHA-256: d10a4ea03f42d92512c24853c75716cd9cd4a591f4cdf0513e44cbe5a89500f9

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