Malicious PDF — malware analysis report

Static analysis result for SHA-256 845a3fdbfcacc553…

MALICIOUS

PDF

111.3 KB Created: 2021-02-19 19:44:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 16ca098ddc39f3ef8f59ebfe2e0ca3cc SHA-1: 12e7b1316cb94ff7b66cfe823086700783b67552 SHA-256: 845a3fdbfcacc553910a412072d3b015b25070aeb990c19d973d7e906da029db
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious sites.

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://maypoin.ru/123?utm_term=zora+neale+hurston+their+eyes+were+watching+god+movie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385427/normal_6010789c0f850.pdfIn PDF document text
    • http://stalekost.site/nuwonukisu707p.pdfIn PDF document text
    • https://cdn.sqhk.co/kabawamurelo/aijidop/piano_man_harmonica_tabs_complete.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/lHrXhfq/41173109283.pdfIn PDF document text
    • http://paganel.world/synonyms_antonyms_homonyms_heteronyms_definitionzvvcd.pdfIn PDF document text
    • https://cdn.sqhk.co/pusutekexu/ghhibhg/venmo_limit_per_week.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_5fd19062b3439.pdfIn PDF document text
    • https://mamasikixatok.weebly.com/uploads/1/3/5/9/135961158/gigoziko_noserajil_terifenuver.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482426/normal_6015beb124b05.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/5giLyij/soccer_world_cup_final_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/ifbijwT/ufc_253_time_california.pdfIn PDF document text
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/zewov.pdfIn PDF document text
    • http://kirudoxidezogu.22web.org/mojajaxavapokoroki.pdfIn PDF document text
    • http://appless.space/olympic_weightlifting_training_progrc09x3.pdfIn PDF document text
    • http://freds.space/solar_2120_wire_feed_welder_for_saleinj0g.pdfIn PDF document text
    • http://razvivatel.blog/8170234292thpdv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bozizivaposenu.epizy.com/xudoguwidelozujozalosoj.pdfIn PDF document text
    • http://moxutomib.rf.gd/zawivoxikowisure.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_off00017760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17760 5564 bytes
SHA-256: 34031c996b49e7f8ec3160730957ee5c5bb8a8cfb4e276bb9efa2f64a2a940d5
font_01_sfnt_off00018a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A3D 11088 bytes
SHA-256: 51fdfa46e32b0c671736465c6ef420df87858f81fe1429367edfb62a77d37145

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