Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac3caef1815d475…

MALICIOUS

PDF

72.5 KB Created: 2020-12-25 18:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c74dac0222813dcfe49a3bcda2d53bf2 SHA-1: 1e08f955ee32f15c87d8ad2a048c4fd9046ca0e8 SHA-256: 8ac3caef1815d47558c2f2e2cd6ee77cba421aff7f2cdb7dd973921b702dc4b0
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded links are designed to lure users to external sites, potentially for credential harvesting or further payload delivery.

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
  • 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.
  • 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/123?utm_term=medical+investigations+cross+word+emergencies+answer In PDF document text
    • https://cdn.sqhk.co/mokavokaven/10ajgjc/free_robux_without_downloading_apps_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/parapirer/ePhesjj/kavepero.pdfIn PDF document text
    • https://neziraninev.weebly.com/uploads/1/3/4/5/134502601/5fc76aa2ee6b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f92701a265ee.pdfIn PDF document text
    • https://bexoxofimimiwox.weebly.com/uploads/1/3/0/7/130775405/jutedobakawugitor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413370/normal_5fa7150e5d243.pdfIn PDF document text
    • https://pitajuzijos.weebly.com/uploads/1/3/4/8/134885257/kosasujipizufep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473638/normal_5fdbc9b56b595.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/2336ec31-fef0-4f88-a32f-1355f7138c61/besak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7f4dd86-7e42-492a-87bc-9e1517e17c0d/challenger_le10_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d0182f6-34c0-4b41-b469-450be29777e4/jelokoxofasevebesi.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/70667154118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f35ba5-9e17-421a-bf25-52941826fabb/fudikazekexi.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_off0000dd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3D 5416 bytes
SHA-256: 09afda8d5b7d34fbac608b67c50eeb06ced46e0fc4570388b21fa6ae851e0cc6
font_01_sfnt_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 11040 bytes
SHA-256: e724ccfc1eb02bd1a67cbe589970e50aa4436ae347a75d653e7359ae3a070bc8

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