Malicious PDF — malware analysis report

Static analysis result for SHA-256 92256dd7147ef14b…

MALICIOUS

PDF

75.4 KB Created: 2021-02-11 02:39:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b928f0bef0ee52a1e227261c12b5903b SHA-1: 9d48d33f8778d8ad7b583f2d7bf513e083e1cb8f SHA-256: 92256dd7147ef14b2a20bf52b5ce1345e0399478719ab8919b1a8ee9331db5b6
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 hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used 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=human+capital+resources+examples PDF link annotation
    • http://rankingcoach-seo.com/vefagwv645.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496170/normal_5fdd38234dff2.pdfIn PDF document text
    • https://porukugo.weebly.com/uploads/1/3/1/3/131380087/7756ba16.pdfIn PDF document text
    • http://trokot-online.xyz/puridiwtro81.pdfIn PDF document text
    • https://tuxupurevulivi.weebly.com/uploads/1/3/0/8/130813143/tagiduwir.pdfIn PDF document text
    • https://pogudemuzam.weebly.com/uploads/1/3/4/0/134018755/7db509a750.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/tusalafagunizivemoku.pdfIn PDF document text
    • https://viluvaxev.weebly.com/uploads/1/3/5/9/135974466/2991208.pdfIn PDF document text
    • http://tvoyoproc.fun/sepobotabuziviwamowiq8r44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374715/normal_5fe482cca943d.pdfIn PDF document text
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/fubojafoserol.pdfIn PDF document text
    • http://nesobaka7.xyz/epigenetica_mecanismos4xwul.pdfIn PDF document text
    • http://ourfanz.com/carnival_breeze_cruise_ship_deck_plan2yp12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taxisariwoboduz.epizy.com/72964196386.pdfIn PDF document text
    • http://dufuvebali.rf.gd/basivejivorasu.pdfIn PDF document text
    • http://desibevazivoxan.rf.gd/arduino_basic_programming_guide.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_off0000eabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABD 5108 bytes
SHA-256: 3fb74f4d8d57eb898edbbd3fc123f9509055695d50595e0dcea2c5f1a815f82b
font_01_sfnt_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 10624 bytes
SHA-256: 71e34bd11a76cff630dbf8552ef288f66e3ac834b9abef04ccad6f3857f8fd44

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