Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca1b9e928bed233…

MALICIOUS

PDF

84.2 KB Created: 2021-03-30 18:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3703f9403a335515d51e07ae15c8b967 SHA-1: e57bfcd9914b51311cc4c75c5330ad72233e0381 SHA-256: 0ca1b9e928bed23313327b63364460c28135962c9866f27865147ca2127a8d62
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains embedded links that point to known malicious redirector infrastructure, specifically identified as 'yafferge.ru'. The document body is heavily obfuscated, but the presence of these malicious links strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=que+es+aines+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4470524/normal_5ffa846c36093.pdfIn PDF document text
    • https://lotuvimipel.weebly.com/uploads/1/3/0/7/130739731/zofalaxudik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387703/normal_6061ccf4a97e8.pdfIn PDF document text
    • http://kopolebukerone.iblogger.org/48844558230.pdfIn PDF document text
    • https://ziduxaxeg.weebly.com/uploads/1/3/1/3/131380546/1989222.pdfIn PDF document text
    • https://zipesonavizi.weebly.com/uploads/1/3/6/0/136052153/fipodiveko.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/sensory_neurons_have_a_resting_potential_based_on_the_efflux_of_potassium_ions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454436/normal_5ff21b1e8203a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381541/normal_5fddae69a7ff6.pdfIn PDF document text
    • https://kudizuvawemexol.weebly.com/uploads/1/3/4/3/134307781/gokupujubus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eddf0bc3-99d1-41a3-9775-955de7f7bad6/94701119505.pdfIn PDF document text
    • http://wofeduvep.rf.gd/vietnam_labour_law_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87cd3893-f06e-4225-8023-d4adeace4a44/can_you_use_a_diffuser_on_straight_hair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/832baf26-e4b0-49fc-85be-fa459f4194b4/xanalixete.pdfIn PDF document text
    • http://dapekafuxururo.myartsonline.com/nufimabosimuwi.pdfIn PDF document text
    • http://loxosufodu.epizy.com/glows_and_grows_template_word.pdfIn PDF document text
    • http://pupekulojam.epizy.com/2099580479.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_off0001093e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093E 4968 bytes
SHA-256: c863216591bed85bc3f270b30c0dc48b45e09d48d7d3a7347778f5e89a03a017
font_01_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 12480 bytes
SHA-256: 39d79a51f3a618b12dfe1c0f999b255e5ed62c9cd35ee4c2028ff194c00e8746

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