Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d856477f6acaac4…

MALICIOUS

PDF

74.4 KB Created: 2021-06-06 02:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a76da18b15293915cae3466572785f83 SHA-1: 7d055a2c9fda618209758d6fae7729211c4db8b5 SHA-256: 6d856477f6acaac430b6809212c7234b9862f713823447434870aa1bfd62acee
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains a large number of external links pointing to other PDFs hosted on disposable domains, a common tactic for SEO manipulation or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan distribution. While no scripts were directly extracted, the structure and URL farm suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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
  • 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://ponafet.ru/123?utm_term=the+boondocks+theme+song++full
    • https://febamepu.weebly.com/uploads/1/3/1/0/131070604/tubulapemawuda.pdf
    • https://xirozakopep.weebly.com/uploads/1/3/4/7/134719339/fuzorafu-jazezevu.pdf
    • https://tewetakejuduz.weebly.com/uploads/1/3/2/7/132740850/d4313c35287.pdf
    • https://jevikefogonilij.weebly.com/uploads/1/3/4/7/134747067/rijawiwe-ladepixu-gaxokelujon.pdf
    • https://risonozolediwar.weebly.com/uploads/1/3/1/3/131398017/9253e1a85.pdf
    • https://kilejotiwig.weebly.com/uploads/1/3/1/4/131406519/273a89e23b.pdf
    • https://dibufasefeduvit.weebly.com/uploads/1/3/5/9/135975636/5098430.pdf
    • https://jikidamasot.weebly.com/uploads/1/3/4/8/134874174/rafimif-dawiweguxukew.pdf
    • https://kilosite.weebly.com/uploads/1/3/0/7/130739696/pigaxigelida_zopifoloraboru_julagajax_zaridegilovanu.pdf
    • https://molilavavabofu.weebly.com/uploads/1/3/5/9/135989114/velizozowamomu_fotujimogopemuj_xanelarulekisa_losopedelal.pdf
    • https://wojatobarub.weebly.com/uploads/1/3/4/6/134612389/delun.pdf
    • https://zolasegugeveji.weebly.com/uploads/1/3/4/0/134040798/kuxiwogotifo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/08344ba0-d1a3-4e3f-bd6b-bd63151928ad/barbi_izgi_filmi_trke_dublaj_izle.pdf
    • http://xovakovawup.pbworks.com/f/jejixuxoji.pdf
    • http://mogulazedub.pbworks.com/w/file/fetch/144686067/how_to_determine_capacity_of_kenmore_refrigerator.pdf
    • http://zilebunod.pbworks.com/f/monobubefurepatim.pdf
    • https://uploads.strikinglycdn.com/files/935c30b7-7fc1-437f-8abd-6e1c86493530/cuadro_sinoptico_de_tipos_de_reacciones_quimicas_organicas.pdf
    • http://matekid.pbworks.com/f/10695861591.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_off0000e507.bin
2cec74cce3e4d1025c708c4be6e28b0955e09bf5f1336d6ffc74c25e0b7bc863		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE507 5284 bytes
font_01_sfnt_off0000f6df.bin
6626c320435945ba79304c2ae668019e6c03c42628d83292c85fd3c79ac8c7c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DF 11340 bytes

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