Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c844e5169ed7bc…

MALICIOUS

PDF

78.6 KB Created: 2021-05-30 15:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d26ba390c1be458e12d4d44d9a87b0e7 SHA-1: ef383e336303ff6873b6bb158e5eaa0a9dec4082 SHA-256: 61c844e5169ed7bc11eb50fd3b70a5446980f06629ffd49f30803c94da106553
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous external links, with a primary URL pointing to a suspicious domain that appears to be a redirector. The presence of many external links on disposable hosting suggests an attempt to manipulate search engine results or distribute 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
  • 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://pelibifir.ru/strik?utm_term=alight+motion+pro+apk+no+watermark+latest+version PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474988/normal_60267d111a274.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455180/normal_60086ad78638e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451941/normal_5fd92f522326f.pdfIn PDF document text
    • https://pigiburoletu.weebly.com/uploads/1/3/2/6/132695467/vejovutazerarujuzaf.pdfIn PDF document text
    • https://lovuzuligo.weebly.com/uploads/1/3/5/3/135315796/liziwawodonisen-wabiduzobu-xisajawegukib-xinufad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486199/normal_60352d7fb5557.pdfIn PDF document text
    • https://sarodinejafa.weebly.com/uploads/1/3/4/7/134762654/nipelufijenani.pdfIn PDF document text
    • https://zagarete.weebly.com/uploads/1/3/4/6/134687236/662732d08e0654.pdfIn PDF document text
    • https://tafivemusuwivik.weebly.com/uploads/1/3/5/3/135322605/5458889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496811/normal_605e129895026.pdfIn PDF document text
    • https://fewibatu.weebly.com/uploads/1/3/4/6/134696711/linepu.pdfIn PDF document text
    • https://pobexapuze.weebly.com/uploads/1/3/0/7/130740180/sojiguneru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465938/normal_5fd9e33e2843f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468289/normal_602a9592816fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_6065089ba1b97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8219dab-42b5-4b99-aa1b-13a4a8181f34/define_moral_community_in_sociology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/622486fc-9e65-4460-873b-5157edd814de/males.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 5436 bytes
SHA-256: 680363bc4e55366f94e42897d5fabc724b0d5916c1748bf0368ae462e1fbb088
font_01_sfnt_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 21736 bytes
SHA-256: bcfc2ae3130eb355539463960b7bd002b0451052f96ff749db321ea033e2e441

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