Malicious PDF — malware analysis report

Static analysis result for SHA-256 080556bc66c78783…

MALICIOUS

PDF

75.5 KB Created: 2021-04-05 14:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cf64fe0ad7b1b0fe17675e695616701c SHA-1: d3500a72af949256334be93f7c1cf2784fdf54f6 SHA-256: 080556bc66c787839abf076f35c531452ad32a4c20300cb7eda4a70ac95379a0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with the links likely serving to distribute further malware or engage in phishing. No scripts were extracted, but the PDF structure itself is used to host a large number of external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=how+to+cite+a+website+apa+7th+edition PDF link annotation
    • https://cdn.sqhk.co/bezakebijuk/Wqgjhje/luke_bryan_songs_new_album.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/qKjUgeB/30th_birthday_parties_for_her.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/Ejbq3ge/90457560113.pdfIn PDF document text
    • http://fukijuwevo.getenjoyment.net/purej.pdfIn PDF document text
    • https://tafakonedazi.weebly.com/uploads/1/3/4/8/134896847/lakexamadedavux-kokamuge-vinaguwej.pdfIn PDF document text
    • https://cdn.sqhk.co/lejukujegomi/SBSqJfm/lewupobevagujebixixudaje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406787/normal_5fe2b36477aa6.pdfIn PDF document text
    • https://bimefitovaj.weebly.com/uploads/1/3/1/4/131437299/rajivixokam-nujuki-lavunul.pdfIn PDF document text
    • https://cdn.sqhk.co/julukimesof/Uijgjgd/6377413115.pdfIn PDF document text
    • https://zexojoru.weebly.com/uploads/1/3/1/4/131409474/5330811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416934/normal_60693df3f1747.pdfIn PDF document text
    • https://cdn.sqhk.co/nebuwaxisiw/hiEents/rockstar_warehouse_gta_5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483338/normal_600ecccf9b392.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454822/normal_5fdff20a26da9.pdfIn PDF document text
    • http://kezijumedet.mypressonline.com/12355697395.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/jhXC2gh/creative_destruction_definition_ap_human_geography.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425727/normal_6012b065195e8.pdfIn PDF document text
    • https://bivofeneduwid.weebly.com/uploads/1/3/1/1/131163561/0d8e45105e5.pdfIn PDF document text
    • http://soldonlakewood.com/9256055162415nwf.pdfIn PDF document text
    • http://gufutaca6.xyz/asme_b16._34_latest_editiontm1j3.pdfIn PDF document text
    • https://rosififobagas.weebly.com/uploads/1/3/1/1/131164218/810ba8afd2f.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/jysjchb/halloweentown_3_marnie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90F 5304 bytes
SHA-256: 69834f4af369828096f87a149ae0c73ed0e7fd4db13b41bda3ddf8b884efce27
font_01_sfnt_off0000fb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 11008 bytes
SHA-256: c0a7bfbd852470affbeaeb592412069014c111b4ba08fa8147943fbe01300baa