Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c3aca34c7602a5…

MALICIOUS

PDF

73.3 KB Created: 2021-01-03 14:08:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f5eeea43598e4d665b6b88dd8ca8d77d SHA-1: 309fec0e536de6b86fd9f6f740137807aaa3b02d SHA-256: 87c3aca34c7602a54dd1c30c53a988a9ab26f3a61a62fb3c31d2cdf9a68faaf6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or to download further malware. The presence of numerous external URIs and the link farm heuristic strongly suggest this 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
  • 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://trafficel.ru/aws?utm_term=melody+audio+songs+telugu PDF link annotation
    • https://kiwosetivugo.weebly.com/uploads/1/3/0/8/130874254/nutefavaju.pdfIn PDF document text
    • https://tolirufatava.weebly.com/uploads/1/3/4/8/134879039/fcaac8778cfc3.pdfIn PDF document text
    • https://cdn.sqhk.co/miwizawi/ajj4Jhf/sabenitobegu.pdfIn PDF document text
    • https://vamibigomez.weebly.com/uploads/1/3/4/4/134438308/nuxewarixuxufomesiwo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491926/normal_5fef66d895e78.pdfIn PDF document text
    • https://bijivabaj.weebly.com/uploads/1/3/4/6/134601785/0d13d2b637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452199/normal_5fbf0a85f12e0.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/idFheZ0/lego_mini_battleship_tutorial.pdfIn PDF document text
    • https://vagovewov.weebly.com/uploads/1/3/4/7/134722861/sigeji_wosak_zomesejamob_tirutetupolofir.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/ab3a255eda76954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499023/normal_5fad9d800f859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387577/normal_5fb8f78b475cb.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/ighjibv/underground_2077_zombie_shooter_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387061/normal_5fc59613b2eb5.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/whbM2Is/xodojaniwonebovifokan.pdfIn PDF document text
    • https://sojugadetoju.weebly.com/uploads/1/3/4/6/134683069/dusaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497358/normal_5fd5f81634530.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 5004 bytes
SHA-256: 1bccc77edaf28fcc366fd76a480001c9a6179102f640ac0783674ae303b78368
font_01_sfnt_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 11196 bytes
SHA-256: ff4f22b64dd0874dd94dd2d250f2b61d29c376c7db1020afb5b7bdd52df966d2

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