Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8d1e56f9ff2e45…

MALICIOUS

PDF

78.5 KB Created: 2021-03-11 11:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 43d4faa795b48717da7c9a8d8d39f095 SHA-1: 621ebbebef4601ad6cc923b2a6cb31cee566c169 SHA-256: 8f8d1e56f9ff2e454775aff785d6434d3fb561f620686583ac32a0a66e8bb98a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external links indicates an attempt to redirect the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fokemale.ru/wix?keyword=happy+birthday+tagalog+song PDF link annotation
    • https://cdn.sqhk.co/lubometusoz/iieihii/31782725151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412996/normal_5fe74eafe67e7.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/34fba5ebb40a0.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/idcngeq/9033073009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_6027ec6b2a189.pdfIn PDF document text
    • https://cdn.sqhk.co/suxupijisajo/fFhj9ib/zejekowaponufu.pdfIn PDF document text
    • https://vemekejafor.weebly.com/uploads/1/3/4/0/134012611/5730176.pdfIn PDF document text
    • https://mafetoga.weebly.com/uploads/1/3/0/8/130874134/1944042.pdfIn PDF document text
    • https://cdn.sqhk.co/xejadukoxeta/bZGhab7/38795799996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464851/normal_6046501fb35df.pdfIn PDF document text
    • https://rodubimalutavos.weebly.com/uploads/1/3/2/6/132695690/tixuzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446287/normal_60409e9ea1db5.pdfIn PDF document text
    • https://rabesala.weebly.com/uploads/1/3/5/3/135394244/4c537365.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/VhfLXUW/eye_of_the_beholder_2_wiki.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/df6cb331-55ee-4e87-9484-c3da19cc869f/bititejigesuzera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47966ee3-c83e-4650-89c5-d088805718d2/kenmore_progressive_canister_vacuum_model_116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d60fd23-fca3-47c4-8cae-121bbffc63ea/does_the_whale_die_in_free_willy.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/slope_intercept_form_equation_maker.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_1152909d9eee4014bbf7bbc2d5299321.pdf?index=trueIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_3e06722f4c024cec8568529cf4620dc6.pdf?index=trueIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_3556daa0e7394b36aa5b2ebf52525cf7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/hongkong_land_annual_report_2017.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_01512d6b50544abb9e4d9351ec8d5478.pdf?index=trueIn 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_off0000f5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 5424 bytes
SHA-256: 04e0c9e794f1497cd26838935fce666795a75f4bac932ad76cab1f006fdad553
font_01_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 10592 bytes
SHA-256: 689f59758122fb4517d54628bad8ef5c25189fbb4a412dc22cda70849976ad91