Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5ea16b8ddaddf7…

MALICIOUS

PDF

71.5 KB Created: 2021-01-13 00:51:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 242f13828ce686351f2e7a6f6536d9b2 SHA-1: 8d9091bb4e051152a907b662329577d89758c7e9 SHA-256: 6c5ea16b8ddaddf7142a5723a0f5f7757cee4b40705ca4ff414bc665fe9c51f5
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to external websites, identified as a link farm. This suggests the primary purpose is to manipulate search engine rankings or redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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=international+dt466+dt570+ht570+service+manual.pdf In PDF document text
    • https://site-1172455.mozfiles.com/files/1172455/mi_10_launcher_pro_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/SMy0t4g/torumofupurig.pdfIn PDF document text
    • https://jelijase.weebly.com/uploads/1/3/4/6/134694082/luvenotubikeju_dizomawi_sedebodefow_xibar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_5faa0e158fd63.pdfIn PDF document text
    • https://cdn.sqhk.co/kataduzoni/B4pPhgp/posajogatawetirip.pdfIn PDF document text
    • https://wugaxaxelapuwu.weebly.com/uploads/1/3/4/5/134595152/gagonigof_rafogarukemavur_ripasexe.pdfIn PDF document text
    • https://wixefonimav.weebly.com/uploads/1/3/1/4/131437632/d3084663c34e42f.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/hfE79jf/dominos_party_favors.pdfIn PDF document text
    • https://tevutilig.weebly.com/uploads/1/3/4/5/134585367/jufufobikadav.pdfIn PDF document text
    • https://sejelenowoloza.weebly.com/uploads/1/3/4/5/134518320/fogusuperi.pdfIn PDF document text
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/vatobiverow.pdfIn PDF document text
    • https://site-1177484.mozfiles.com/files/1177484/miner_dash_kongregate.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD613 6012 bytes
SHA-256: 625c3e67c9619baeb0ffa02f717f5f85cd0c0646f6caaa2b92b3a1449f825993
font_01_sfnt_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 11600 bytes
SHA-256: 8e14751b8124657a4461fec8ff22155cc9962c6708afa4c2cf161c33bdf34e4b

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