Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3fa5ae4f72fead…

MALICIOUS

PDF

75.3 KB Created: 2021-03-18 01:20:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1e455e1bfb039dd6cdf20299052f60d6 SHA-1: 341468e866233c94ce45fb847713926b96c59b95 SHA-256: 2b3fa5ae4f72fead3775e58b3e95949259456edffd57eb226534ba9d4ce1a73f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, directing users to numerous external URLs, one of which is `https://xezojetit.ru/award?keyword=calculus+early+transcendentals+11th+edition+pdf+free`. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to drive traffic to potentially malicious or phishing sites, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=calculus+early+transcendentals+11th+edition+pdf+free PDF link annotation
    • http://dapurixid.sportsontheweb.net/bolted_connection_nptel.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/icgc3ib/hot_fishing_spots_near_me.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/pijama.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/list_ten_element_of_system_approach_to_instruction.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/gomuserarakoguguwobax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_5fd93b9990e2e.pdfIn PDF document text
    • https://cdn.sqhk.co/zaborofisi/ggjDpjd/29082908185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445890/normal_5fde580e89029.pdfIn PDF document text
    • http://tanolugulutewu.medianewsonline.com/xumukugulalobotaxaxitafil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://79d8ee67-2172-45f8-9737-086b37aa5bdf.filesusr.com/ugd/2ab2ae_612dbda80da840ffabef75befdf38ebc.pdf?index=trueIn PDF document text
    • http://xirexadugimog.atwebpages.com/99848644204.pdfIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_fc90c8ef8e894f608f67fba85b3c4192.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a94a79-510a-450b-8aaa-0e6712271ff7/29005020493.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64802609-5de6-4771-adad-86bb9df46a8f/linux_shell_scripting_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2de3881-86f4-49b5-866b-e9bf9ae813a3/vulepiwa.pdfIn PDF document text
    • http://kexomun.myartsonline.com/gajefomogigejawu.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_05ec788b8a5943c9991d718ce8a7ebc9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da3e52cf-9635-4de0-a84f-fc4584aa3acf/samsung_m2825dw_wireless_setup_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9875da5b-7bb0-407e-9cca-5b7bcf700df8/jorimiwatasuwiwa.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_off0000e622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 5304 bytes
SHA-256: 0ece0fa69810bfb11d654e3b3eae78bfff773f1c2f45a544959972ad007ab314
font_01_sfnt_off0000f82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 11588 bytes
SHA-256: b97cd63e9b827720eac08cf0f5006efcedb7bb3968a1efc68ef0b4c89adb24ea