Malicious PDF — malware analysis report

Static analysis result for SHA-256 9789b619e3e48951…

MALICIOUS

PDF

79.9 KB Created: 2021-02-17 06:58:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 704c67d0bb4430d1837545391cccc9ce SHA-1: 0a270aaf850e2b18198a95ffa2e377efae9215cc SHA-256: 9789b619e3e48951a19ad3f8ff7a188fd6c353ce9e758fe9ab9d1cf3bc3d357c
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a redirector link and a large link farm. The ML classifier also strongly indicated maliciousness. The embedded links suggest an attempt to lure users to external sites, potentially for phishing or malware distribution.

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=hmdx+dynamite+bluetooth+speaker+price In PDF document text
    • https://cdn-cms.f-static.net/uploads/4447460/normal_5fdb02c07f231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_5fd7c8f2c3af9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_602302915dd63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393499/normal_60175fc5942ac.pdfIn PDF document text
    • https://nebofubegifeso.weebly.com/uploads/1/3/1/4/131437549/zibix.pdfIn PDF document text
    • http://topagudupowugi.iblogger.org/gatamufusisaxugabo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367313/normal_5fc69ebe59216.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401519/normal_5fe4760e24bdb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405413/normal_5feb4232da922.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471988/normal_5fc70d040e6d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403540/normal_60055f23ec61d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wereguvepowu.epizy.com/jemeruni.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/23104095252.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/parikawinirutapa.pdfIn PDF document text
    • http://mojilobopage.rf.gd/auma_sa_actuator_manual.pdfIn PDF document text
    • http://rotaduwifomol.rf.gd/bollywood_punjabi_song_mr_jatt.pdfIn PDF document text
    • http://disefubukub.rf.gd/fuzigibubu.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_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 5648 bytes
SHA-256: 8e03a8aee656fb046c8aa66d63443e86261622347c86421fe2c08962fc556133
font_01_sfnt_off00010ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAD 10440 bytes
SHA-256: 6831db84becb45050c747f12326c2cee184bf391c717f072806908acfc106923

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