Malicious PDF — malware analysis report

Static analysis result for SHA-256 554c4aefd4317032…

MALICIOUS

PDF

79.1 KB Created: 2021-05-03 03:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 32657c1747bef3689ae2c1fa41c332e9 SHA-1: 0add86367299792566a5f52088368cb7c14b3985 SHA-256: 554c4aefd4317032b4c45f30efa9291baaea4610942657e941d945fc5d4ca888
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs point to various PDF files, likely serving as a lure or a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/strik?utm_term=how+to+cook+rice+pudding+with+condensed+milk PDF link annotation
    • http://hot-money.fun/sheet_vinyl_flooring_remnants_near_mett3jy.pdfIn PDF document text
    • http://navaram.online/71767504735xie85.pdfIn PDF document text
    • https://guwubujurod.weebly.com/uploads/1/3/1/4/131438509/pojibujotid_xelumafogato_nepiwemuvowi_nesezenipixo.pdfIn PDF document text
    • https://kedixusivazusug.weebly.com/uploads/1/3/4/8/134869684/zalaw_tewakevud_panisatusawoxe_javomofebode.pdfIn PDF document text
    • http://xepuxesadara.mypressonline.com/also_sprach_zarathustra_strauss.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/29609375519.pdfIn PDF document text
    • http://1pokypki.website/how_to_set_tax_on_casio_pcr-t273bzh9l.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/mazixuw.pdfIn PDF document text
    • https://binenivav.weebly.com/uploads/1/3/4/5/134516867/9b87fc6ca90.pdfIn PDF document text
    • http://rubeatyshop.xyz/tulejatejodilodufubulmvkx.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/kuzuzavgeq0.pdfIn PDF document text
    • https://xunumiselodaz.weebly.com/uploads/1/3/0/7/130775676/buxaligudapenupe.pdfIn PDF document text
    • http://mebets.xyz/vasaxesalagosopozavowemajxbk9.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/what_is_perception_peer_reviewed_articlese059l.pdfIn PDF document text
    • http://ing-cliente.com/meluxotosawopudamogifiw7jz5v.pdfIn PDF document text
    • https://sojimivur.weebly.com/uploads/1/3/4/8/134883767/2699838.pdfIn PDF document text
    • http://mebovedu.getenjoyment.net/.pdfIn PDF document text
    • http://itclick.pro/3494841439864jr5.pdfIn PDF document text
    • http://pornbustyvids.com/9056963774471w09.pdfIn PDF document text
    • https://jugikezifu.weebly.com/uploads/1/3/4/6/134654678/mewavatobuxixibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_0c3e93330737472599bf7638c48a9618.pdf?index=trueIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_c8c76ef5c85a47589d20ac4777300e7f.pdf?index=trueIn PDF document text
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_87d1ac529d764f5c85429daa057ebb3b.pdf?index=trueIn PDF document text
    • https://ebd157e6-94c3-4ff5-b3ab-516f87acbde6.filesusr.com/ugd/e87473_59504074aeaf4f609f61f9dd2f138925.pdf?index=trueIn PDF document text
    • http://xirexadugimog.atwebpages.com/cambios_biologicos_en_el_adulto_mayor.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_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 5392 bytes
SHA-256: bf2717e8f611de94e5049e27d41f8db8aee822f14e08a39d3fe47f456bdf7539
font_01_sfnt_off00010524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 12400 bytes
SHA-256: 4022fa064f25b20f4337dcced0c0537d6781729703b07e444d9006e0a766c607