Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe9e8c9b8ec71f5…

MALICIOUS

PDF

66.0 KB Created: 2020-11-17 08:02:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c982b40b833dd0336defbd75e4502f06 SHA-1: b727a1171f0dbbd167e270912666edfb56d2c385 SHA-256: dfe9e8c9b8ec71f5703adb65cbb864b0b3cf920fbc5e48825cdfa473f422634f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs pointing to disposable hosting services, likely to distribute further malicious content or engage in SEO manipulation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's primary purpose is to redirect users to these external sites.

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/123?utm_term=dublin+middle+school+5 PDF link annotation
    • https://sivagodumojuji.weebly.com/uploads/1/3/4/2/134235915/jumupufufufini-folagetukuzus.pdfIn PDF document text
    • https://gipivibeg.weebly.com/uploads/1/3/4/3/134341606/559168d4.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/fegin.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/fakadezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_5fa75f6a8891b.pdfIn PDF document text
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/1046541.pdfIn PDF document text
    • https://gewosawoma.weebly.com/uploads/1/3/0/7/130739201/4497123.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/pogijunewadukowa.pdfIn PDF document text
    • https://ririrufazerox.weebly.com/uploads/1/3/4/5/134501654/rigakoloparax.pdfIn PDF document text
    • https://wukemurorafol.weebly.com/uploads/1/3/4/3/134338373/jepuvusegikitazani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_5f98a353b81d2.pdfIn PDF document text
    • https://nosekuge.weebly.com/uploads/1/3/2/7/132740467/xoditegalop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_5f9440f7caf3a.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/9b9d03b9-5753-42c1-b407-ee633824f74f/8038692762.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_off0000c7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DC 5136 bytes
SHA-256: 6819a47fd13b70a9170d8fc7861ac2add8ab98c412d4313dbe5cdfaf60ea08db
font_01_sfnt_off0000d935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD935 9996 bytes
SHA-256: f9eb1970ca2ab10fb92b8f0496b0de24c19b22371ff2036e5095f2991bf38630

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