Malicious PDF — malware analysis report

Static analysis result for SHA-256 db141e1ea295c587…

MALICIOUS

PDF

79.9 KB Created: 2021-03-29 09:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 66cf0c4182a652083dc9193140e2ad03 SHA-1: 7fc8f4a5186631b79e86794412ce70ba842d4b14 SHA-256: db141e1ea295c587a615bf6c23e0bb54d4db9a771594cc52126a728797324f2c
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It functions as a link farm, directing users to numerous external URLs hosted on disposable domains, likely to facilitate the download of further malicious content. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/123?utm_term=android+support+v7+dependency PDF link annotation
    • https://cdn.sqhk.co/wanaxowuwot/5bPjhjc/download_game_animal_sniper_deer_hunting_mod_apk.pdfIn PDF document text
    • https://dopezobobuk.weebly.com/uploads/1/3/4/5/134503431/rezumomefegozalekor.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/juxudelonaxasixovatuten.pdfIn PDF document text
    • https://vabudefun.weebly.com/uploads/1/3/0/7/130775589/688c692bf6d1b00.pdfIn PDF document text
    • https://cdn.sqhk.co/pojimisuso/ihgv1ig/grand_summoners_anime_action_rpg.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/6171034.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/5892f403-ad84-4c1f-9160-5e31a6f1812a/puvan.pdfIn PDF document text
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_edb49f9b7bf1417990db8449a5d58586.pdf?index=trueIn PDF document text
    • http://dafukip.myartsonline.com/vanosazubuxaxesuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a5bded1-153f-447e-a509-e62cdfddbd2a/percy_jackson_greek_gods_lexile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32fdfea5-0f68-4238-a6ff-7951eba21f61/international_marketing_strategy_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6e724cc-ca49-43ac-bc2e-ce7603e3b88e/68363648686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37602a1a-e8fb-43d9-84e8-7f4b032b3f74/pulok.pdfIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_8285e198bf514261a489c82ca6edd7f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e07f056f-74e3-46aa-9e03-6b46dd8518a4/varian_intermediate_microeconomics_9th_edition.pdfIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_955687d4a57647698b0f6eec7a59db03.pdf?index=trueIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_08e40b11de2f4f3d89a67e06135212ed.pdf?index=trueIn 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_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 5056 bytes
SHA-256: f61c7fb7bba7ebb948995fff8510c8ef7d98ffd1ec033eb56b633337a680256f
font_01_sfnt_off000109d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 12200 bytes
SHA-256: a71aa51a076dfa9ac134863a3c57a33b04fcfa314f06e9ed7b18e17aafe6496d