Malicious PDF — malware analysis report

Static analysis result for SHA-256 e923ce10ed18e5a0…

MALICIOUS

PDF

78.6 KB Created: 2020-12-24 22:04:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b81f69c5808238984802f5e98c7e0279 SHA-1: 750a1294646a5f444c52dd2814404573591ab38f SHA-256: e923ce10ed18e5a0ee662a2b74cc518b845acf21001f1833762f1abc1fdecc83
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which could lead to credential theft or exploitation.

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://traffine.ru/aws?utm_term=excursion+tv+channel+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_5fd7cf1943835.pdfIn PDF document text
    • https://bisitewo.weebly.com/uploads/1/3/4/4/134496646/fifug-xunupuxase-lekowamifip-tinapiban.pdfIn PDF document text
    • https://cdn.sqhk.co/kurapobal/R1ykM0f/airline_tycoon_online_3.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/bLZ6Hid/rejox.pdfIn PDF document text
    • https://kojovade.weebly.com/uploads/1/3/4/6/134681743/43a734de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_5f9a5e86a9d4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492580/normal_5fbfb3cde624c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443814/normal_5fdbdf121fdc9.pdfIn PDF document text
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/tefidasixenabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381083/normal_5fd76b2a33d30.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/jiimUhe/fr_legends_decal_codes_2019.pdfIn PDF document text
    • https://nelovemisero.weebly.com/uploads/1/3/4/3/134347795/3aef660bfba89c.pdfIn PDF document text
    • https://cdn.sqhk.co/jalizovi/iijgjiy/dark_sword_2_mod_apk_latest_version.pdfIn PDF document text
    • https://matekulelesij.weebly.com/uploads/1/3/4/8/134858821/vemenab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/depiguxixun.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_off0000f305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 5288 bytes
SHA-256: 2dedbc1118c235216b8c48041c5e9cbee9994914fff81be18b4d1cc8d718bd44
font_01_sfnt_off00010506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 12656 bytes
SHA-256: b1f0fc4a0997b5ec602a896944c5afa9dd852a302da4166df081b001522106e0

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