Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc7485b556c45c3…

MALICIOUS

PDF

78.5 KB Created: 2021-01-03 03:30:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 2e96c338a955e36e12f09f10f8abb491 SHA-1: 751e329fc6cb90fda54c6caea2544701428b65a4 SHA-256: ecc7485b556c45c3aafbba0f5d7ea42f2698c87228e9c5929ed4e03adc73568b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains multiple embedded URLs, including one pointing to 'traffset.ru', which is likely part of a malicious redirection chain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://traffset.ru/aws?utm_term=information+about+fourth+generation+computer PDF link annotation
    • https://jevixivuxed.weebly.com/uploads/1/3/4/6/134622771/d7d5984ab501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443619/normal_5fb985e14f297.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495558/normal_5fee9ba8dd618.pdfIn PDF document text
    • https://cdn.sqhk.co/joxutedunik/mWAgj0V/ice_cream_parlor_menu_template.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/vBAjejd/ringtones_free_download_android_mobile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450732/normal_5fc9ce4141645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503035/normal_5fb486d6bfb81.pdfIn PDF document text
    • https://gaxopekel.weebly.com/uploads/1/3/0/9/130969853/felumageti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417312/normal_5fd5fdc124f65.pdfIn PDF document text
    • https://cdn.sqhk.co/rinilafexowi/ypidicO/nav_canada_air_traffic_controller_jobs.pdfIn PDF document text
    • https://xoludifatak.weebly.com/uploads/1/3/4/4/134477652/6958858.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/retisovojor/rotareguxulagikekufomus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c30c1648-eb01-437b-a079-ceeac93833f3/nokuzafonemewitiviluwemir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94cb9627-a9e2-4c89-b59e-b12ee33b5948/electric_spark_igniter.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_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 5296 bytes
SHA-256: ecc1a69e7fa65efca4437bdeaa1b4fbc22aebfe581c866a871c478077cf324f5
font_01_sfnt_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 11116 bytes
SHA-256: 876288a657c6015fa97447958cf08c398209a798a1b57aab471e7e2b1a948702

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