Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0aa6bca23eeac8…

MALICIOUS

PDF

83.8 KB Created: 2021-04-14 06:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8171b1a5091270fa1a81c4c83e038f04 SHA-1: 912e07739f185416f8aac880134dc7d3f53dbbb6 SHA-256: 1e0aa6bca23eeac80474cab10fcec724805e9b5a7038a5110a58a5517a602ca1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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://botokaw.ru/strik?utm_term=sharp+aquos+lc-60le640u+wont+turn+on PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494681/normal_602b3415a810b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378160/normal_5fcdd1f92092b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378846/normal_6042b7e99bca4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410989/normal_602fa5a8968be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450152/normal_601da2ddd69fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390056/normal_60032849927f1.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/9370490.pdfIn PDF document text
    • https://kozenuxifojani.weebly.com/uploads/1/3/4/6/134665776/kojixawewufe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382190/normal_5fde4ec3354ad.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/company_of_heroes_movie_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409623/normal_603b964e994ae.pdfIn PDF document text
    • http://malolufixanovas.sportsontheweb.net/35366382615.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/fivetofa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9e844689-d025-4dcc-9e99-7d97e021bcab/xozujanasuxedakot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b948ffa1-19e7-4202-ba78-5d547695f2c0/how_to_program_multi_code_remote_by_linear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c899958a-81a3-484a-befb-44472549fd8c/chattanooga_hydrocollator_model_2402_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b35e553-7416-4f62-aad1-1942860ed7df/ingenuity_boutique_collection_smartsize_swing_and_rocker_reviews.pdfIn PDF document text
    • http://gepafelixadu.onlinewebshop.net/teachers_day_speech_in_assamese.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 5592 bytes
SHA-256: d96cab1fc87d41f0a09ecc5736cff14e5bf77bd32f618bdb7341aef7eed0c2fa
font_01_sfnt_off00010bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF0 11896 bytes
SHA-256: e9e964810617a768b685c94c1b359c56def78f397373d1b4f42c6ec5e01ad5f2
font_02_sfnt_off000133c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176