Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1750447cf2f98e…

MALICIOUS

PDF

72.0 KB Created: 2021-03-22 10:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 20034060e7e94944d53a983402167de0 SHA-1: 924759863ce3c42d33b7a5633bf9ab85de70e924 SHA-256: 8d1750447cf2f98eab209b57a2843e90246bc7f7dddde361bbfda4fe53123f9c
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to reference quiz answers, reinforcing the lure for users seeking specific information. The presence of numerous external URLs indicates an attempt to redirect users to potentially malicious content or phishing 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://vilenefex.ru/123?utm_term=jasperactive+lesson+7+quiz+answers PDF link annotation
    • http://zoluwofemofuper.sportsontheweb.net/what_is_knowledge_framework.pdfIn PDF document text
    • https://ganupedudajoz.weebly.com/uploads/1/3/4/5/134586443/60ea1022a8a627.pdfIn PDF document text
    • http://meetraisins.club/bakuladoxunajelebokafznqg.pdfIn PDF document text
    • http://serviceforyou.site/pumakufidozkg1m7.pdfIn PDF document text
    • http://sokfresh.fun/1595469099467ahd.pdfIn PDF document text
    • https://bisudika.weebly.com/uploads/1/3/4/3/134366448/remubijuf_dijel.pdfIn PDF document text
    • http://heliusdesign.ru/249085958383hlbd.pdfIn PDF document text
    • http://vulufinagi.mypressonline.com/kewon.pdfIn PDF document text
    • http://ecoservice-vlad.ru/history_of_rome_podcast_episode_117su7i3.pdfIn PDF document text
    • http://justamorem.com/can_you_ever_enter_gerudo_town_as_a_manc7x68.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/da6a7990556.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_f74a2b68938240e8ae9e25bc77d1bf6b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb8b9ff0-52f1-48a5-a1c4-e405ddfeaf64/vagofokagimu.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_39b2d41fbb734457aa1ecccfc049e6cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4988d08-25bf-4950-a5d3-28d7d623a837/gufetirejusor.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/nenozonireferozedonanewi.pdfIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_ffd4ee5197c642169fd50ac044663506.pdf?index=trueIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_b10cd988fe134150ad6ae41a3f57fbd2.pdf?index=trueIn 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_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 5324 bytes
SHA-256: 1b86466d04217e04c625d4e639a70d2def790e8047ce1abb73601d3b70118979
font_01_sfnt_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 11684 bytes
SHA-256: 2b3f0d879062502c215500154160df8359738234a8322ee1ca47aa174c1d9c0a

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