Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d16700842024b97…

MALICIOUS

PDF

81.0 KB Created: 2021-05-04 09:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6e2c6b8964dcf30dedd878896f27e40c SHA-1: 278459f4eb72c64f724cb589e3c3fcb77264b8b1 SHA-256: 4d16700842024b9752cd5689fde097308f8488946c15e1481d4b0f50c9bf4dad
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The primary malicious URL identified is https://midufefew.ru/strik, which is likely used to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=canon+pixma+mg6320+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499317/normal_603bf47e0fbb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475859/normal_60443dc344af4.pdfIn PDF document text
    • https://xemalijojododud.weebly.com/uploads/1/3/0/9/130969235/9555293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484805/normal_604223de4ab4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413122/normal_602e5d3339d8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417023/normal_6031be1d47334.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412170/normal_5ffcf5b74968c.pdfIn PDF document text
    • https://sedemosifov.weebly.com/uploads/1/3/0/8/130874126/e9c70ad35df1f5e.pdfIn PDF document text
    • https://zutiwijutorezaz.weebly.com/uploads/1/3/4/3/134354078/nisapuxozipeze_ketinuxep_sawafezor.pdfIn PDF document text
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/c3a84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404515/normal_6060ef43a09b6.pdfIn PDF document text
    • https://musixafura.weebly.com/uploads/1/3/5/3/135321149/nejowedoxoliri-kiwopu-lumiwevozaz.pdfIn PDF document text
    • https://bigunumefojetaw.weebly.com/uploads/1/3/4/3/134314030/5fc3741.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_48108d81d2944c84bdf90bc7701a0e0a.pdf?index=trueIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_0dc6480864334c0c975c1fb7c4994ccb.pdf?index=trueIn PDF document text
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_b415fe49c2034144bd9278506be9b374.pdf?index=trueIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_2f69f3fa7c7e47c29ffe95e8a207ce26.pdf?index=trueIn PDF document text
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_d2d9ad1f39fd42e184e68df77ba1d2d9.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_12816b74dbc54007924d8417772a85b0.pdf?index=trueIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_0bd848af484242659c6f201139e15295.pdf?index=trueIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_5fa5a7e1d3e14aeaaec8c1eb79d5aadc.pdf?index=trueIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_2926db02fb454816af1862e311fa447e.pdf?index=trueIn 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_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 5428 bytes
SHA-256: 5701b6318283ab6e17851fb5c5ab365358af01270a52c0a7a7e9685a8290f824
font_01_sfnt_off00010f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 11548 bytes
SHA-256: a2218fb9e4310d4df3aa0f5bf3794bcaf1ca801eb11bdb982d6b7e7e88c22d10