Malicious PDF — malware analysis report

Static analysis result for SHA-256 71536e1adabbc544…

MALICIOUS

PDF

73.3 KB Created: 2021-02-19 06:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 00d6bab2d011ed1513428a87ed0571a7 SHA-1: 2776db01ac8c08a6bbe553d914685bf68bb1bd2f SHA-256: 71536e1adabbc544d8fd3bf780ce85bd4b50f3e4323901c93b2204e9a35dfe64
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of links, many of which point to disposable hosting and redirect to malicious infrastructure. The primary redirector URL, 'https://yafferge.ru/strik?utm_term=how+to+get+rid+of+santivirus+on+windows+10', suggests a lure related to antivirus removal, likely intended to trick users into downloading malware or falling for a scam. The ML classifier and ClamAV detection strongly indicate malicious intent.

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=how+to+get+rid+of+santivirus+on+windows+10 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373527/normal_5fdaee2043342.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/gciiTgg/14476226950.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/xaxirukipom.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/jgijdhg/stack_ball_3d_play_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461481/normal_6027571c34e59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414341/normal_5fe98244762f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369653/normal_5fca7507dd7d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_60277822719f7.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/watoripixaravoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465705/normal_5fe0572e69eed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409813/normal_6000680b65eb3.pdfIn PDF document text
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/8e7cdd4.pdfIn PDF document text
    • https://rerararomimin.weebly.com/uploads/1/3/1/3/131383042/xulenuzevadu.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/jevedijadiki/anjathe_tamil_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/85309654498.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/salozipudugubefuzub.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/rabomejudatozajifamilow.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/bewujixogad.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_off0000e36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 5352 bytes
SHA-256: 1cd35a20da17da54be14e5422116f05b5d0317a069fb974161391ba88c3d4d32
font_01_sfnt_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 9960 bytes
SHA-256: 98e6ea2a99a8e8d6fc3afbbeb846e5b8fd9ae81ccdd830e2ddcd1f02d98097b7

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