Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c0d1a4816bf093…

MALICIOUS

PDF

74.1 KB Created: 2021-02-21 05:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c6dcb196d0505c0bec441110385cdb15 SHA-1: d472bb2d9d6965795d79ef062e7fe41759b5cc17 SHA-256: 03c0d1a4816bf0935b275ef0a83dcd757521692892256458ce122a7157ac54b0
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link and a link farm. The document contains numerous embedded URLs pointing to external PDFs hosted on disposable domains, suggesting a phishing or SEO manipulation scheme. The primary malicious URL identified is https://yafferge.ru/strik, which likely serves as a redirector to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=convert+windows+live+movie+maker+project+%2528.wlmp%2529+to+mp4 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413235/normal_6031bd092d3f5.pdfIn PDF document text
    • http://malespw.xyz/ralitagxm268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459174/normal_5fd6a13d5b613.pdfIn PDF document text
    • https://fadusibolene.weebly.com/uploads/1/3/4/0/134042843/2582462.pdfIn PDF document text
    • https://komimarokobak.weebly.com/uploads/1/3/4/6/134604519/a365e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384026/normal_5ff84affbd2a2.pdfIn PDF document text
    • http://greatholl.com/the_standard_hotel_rooftop_bar_menugtqca.pdfIn PDF document text
    • https://kedefakoriwo.weebly.com/uploads/1/3/1/1/131164231/rozozixubizof.pdfIn PDF document text
    • https://jogivugu.weebly.com/uploads/1/3/2/7/132740949/4091060.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410004/normal_5fc7f141ea9f1.pdfIn PDF document text
    • https://gelupolo.weebly.com/uploads/1/3/5/3/135314506/jitezi-suwexexavineso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385850/normal_6010f7fb984b7.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/gupojakami/sunshine_in_my_pocket_lyrics_and_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/muvalabubedujujanalozube.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_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 5688 bytes
SHA-256: 69317b311a3eb5a8ab6480bbc18a3c468af4c3806ab1551d77fb92198ee162a6
font_01_sfnt_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 10700 bytes
SHA-256: e69b133b4bb95cc402d01fd7ec948365167a5e42b4d44cb8a975adf1ac24c45c

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