Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c89b76507ca678e…

MALICIOUS

PDF

62.5 KB Created: 2020-12-14 20:54:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: efce39637d3bfe7d410cabe026e5d56d SHA-1: 7b0427fe0e3308887c97716d73080ff4b59b3130 SHA-256: 8c89b76507ca678e11a17ae275f3c5d53fb3411675b5997ba272c8638b198023
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file exhibits characteristics of a malicious redirector and link farm, containing numerous links to external PDFs hosted on disposable domains. The presence of a link to known malicious infrastructure and the high ML classifier score strongly suggest malicious intent, likely for SEO manipulation or to distribute further malware. No scripts were extracted, but the structure and embedded URLs indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://traffking.ru/123?utm_term=haier+mini+fridge+service+manual In PDF document text
    • https://zutofamofiselas.weebly.com/uploads/1/3/4/0/134040676/d2ffabf572.pdfIn PDF document text
    • https://tozisodije.weebly.com/uploads/1/3/4/4/134486105/6777751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391909/normal_5fc1fae4038cf.pdfIn PDF document text
    • https://foraketarikovef.weebly.com/uploads/1/3/4/6/134608655/4ab1345873.pdfIn PDF document text
    • https://sedivunoruset.weebly.com/uploads/1/3/4/8/134859312/kedubexarukevomonol.pdfIn PDF document text
    • https://femaxina.weebly.com/uploads/1/3/4/8/134886911/8049234.pdfIn PDF document text
    • https://denonifo.weebly.com/uploads/1/3/4/7/134709080/6ced5d51f6807d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459631/normal_5fbc369a83656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404953/normal_5f9598e4adffa.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/ziribibadi.pdfIn PDF document text
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/nujolabunef_sovevamuzuri_xuwaxesasiw_magosezogife.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d33c8fea-b68f-46a5-a241-cd467019c360/pabivezexexibex.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ada3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA3 5052 bytes
SHA-256: 98420e480d653bbf156c2a92765d8fcbedb43e96d93e4f50bbd59da20eb5878e
font_01_sfnt_off0000beb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB0 9548 bytes
SHA-256: dad6801f6943b7f99ffe0d5a3e700fe120a11b7300861bc3f460cf86e18e198f
font_02_sfnt_off0000df38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF38 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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