Malicious PDF — malware analysis report

Static analysis result for SHA-256 819115cacce14328…

MALICIOUS

PDF

72.2 KB Created: 2021-06-09 07:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74e14300bf2cb939bef54bfc1b23f421 SHA-1: d275bd6b6fc622e35e5eb4d582def813ab0b2ae2 SHA-256: 819115cacce1432864d44430ef14887f74abe5b7c46b0bcd184522d45801e795
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the primary goal is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/pbw?utm_term=dreams+of+fiance+cheating
    • https://nivufojafofe.weebly.com/uploads/1/3/4/2/134265756/56c9cfc524db0b.pdf
    • https://cdn-cms.f-static.net/uploads/4465397/normal_5fdbc93459103.pdf
    • https://gevabebixufusaf.weebly.com/uploads/1/3/4/6/134689319/e2875a59703.pdf
    • https://pogivigewe.weebly.com/uploads/1/3/1/4/131438874/6013188.pdf
    • https://dajukufatob.weebly.com/uploads/1/3/4/3/134345308/90f951028b8324.pdf
    • https://static.s123-cdn-static.com/uploads/4491151/normal_5fffe720e41f5.pdf
    • https://cdn-cms.f-static.net/uploads/4417137/normal_606a35f04ed50.pdf
    • https://static.s123-cdn-static.com/uploads/4387582/normal_5ff45eff2fd4e.pdf
    • https://cdn-cms.f-static.net/uploads/4410986/normal_601f232309f9d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bopidix.pbworks.com/w/file/fetch/144924711/35133449203.pdf
    • https://uploads.strikinglycdn.com/files/d369bf73-59a4-4ab1-ae72-40e23124e2ef/lifufa.pdf
    • https://uploads.strikinglycdn.com/files/deddc5c2-0d0f-4af4-9d7a-647b4fd7e5f0/41683334408.pdf
    • http://wotetidi.pbworks.com/f/turkish_airlines_ticket_number_format.pdf
    • https://uploads.strikinglycdn.com/files/d0d6987a-a1db-4eb3-8966-949ae118912f/el_ser_uno_libro_vi.pdf
    • https://uploads.strikinglycdn.com/files/9a0ccae8-7541-4ca6-bb95-075fb72f6c70/64551929131.pdf
    • http://gamaxidad.pbworks.com/f/dofometezurig.pdf
    • https://uploads.strikinglycdn.com/files/f0fba1ca-1bf5-42ee-a50b-60c9842e7a64/59143484352.pdf
    • https://uploads.strikinglycdn.com/files/f8417eac-e74b-4f8b-b8f8-a007f1befe35/67205687384.pdf
    • http://fipivuzigoge.pbworks.com/w/file/fetch/144424488/velaxanoponosuwubev.pdf
    • https://uploads.strikinglycdn.com/files/c8dedeae-c094-467c-9a33-85ef71c9121f/mapuset.pdf
    • http://jojekepodef.pbworks.com/f/zogewab.pdf
    • https://uploads.strikinglycdn.com/files/63b16e22-8161-44ce-af1b-9517311d4651/xewule.pdf
    • https://uploads.strikinglycdn.com/files/cbae0bd6-8bbe-4935-8c48-3a269053fc90/10035554945.pdf
    • http://fatakalewene.pbworks.com/f/download_summertime_saga_0.18_6_apk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e072.bin
16a58bdd50e4c93023acd33ac95c019433c7e9f636760aed1fffcf68b29facff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 5264 bytes
font_01_sfnt_off0000f231.bin
00c28416e7b4fe025863ffc094f8c04d943172a88052a8ce8763cc35eb7760f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 9908 bytes

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