Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ade98e6888bd66…

MALICIOUS

PDF

70.3 KB Created: 2021-01-16 23:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4e0a60aaa7450f5718acc882bf1b03ff SHA-1: 6a01852b3852d3b1a17e5d95a393534491a20b73 SHA-256: 50ade98e6888bd664b31a6d06a36d252e9ad88f8421d0ea2cf0e2fa9b13c7638
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing numerous embedded links, many of which point to disposable hosting services and redirector infrastructure. Heuristics indicate it functions as a link farm, likely intended to lure users to malicious sites. The presence of a known malicious redirector URL further supports this assessment.

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://cctraff.ru/123?utm_term=water+is+the+essence+of+life+zoolander In PDF document text
    • https://jubipolofolexi.weebly.com/uploads/1/3/2/3/132302872/9222429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412909/normal_5f98da61dfb94.pdfIn PDF document text
    • https://rejipunedeze.weebly.com/uploads/1/3/4/6/134652096/47094.pdfIn PDF document text
    • https://cdn.sqhk.co/pamezuravuno/tDDQ5ge/valkyrie_profile_lenneth_psn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403131/normal_5f98c7c794f01.pdfIn PDF document text
    • https://vijilipaguwojig.weebly.com/uploads/1/3/4/8/134872157/mibuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455377/normal_5fe99f236032c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529087/normal_5fea0a3e2835a.pdfIn PDF document text
    • https://figapizezedop.weebly.com/uploads/1/3/4/3/134364787/puxoxide_lejikuju.pdfIn PDF document text
    • https://vawenajibafadak.weebly.com/uploads/1/3/1/3/131384306/6552334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452148/normal_5fd8a2fa5c74f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427793/normal_5fceacf2cfbea.pdfIn PDF document text
    • https://mabobuloxulekev.weebly.com/uploads/1/3/4/6/134692970/repetuputujuwidupugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476429/normal_5fa6a80b9023f.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/vekodupiwarobi/76265569295.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_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 5172 bytes
SHA-256: 5295a976d23f82d58f1954b84b8d3650360ac4e1f3f5d155ca71cec46b4e19bc
font_01_sfnt_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 10328 bytes
SHA-256: d610469938199f4611e945b28c634366dc19a8dad38d9c30221ccd764593a30a

Open this report in the interactive analyzer, or submit your own file for analysis.