Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf11f71d24dc0e61…

MALICIOUS

PDF

75.1 KB Created: 2021-04-17 04:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4d512a41956bb55d70b3e5e61dc2069 SHA-1: ceae1349f49227066bd3aa23962e9888d780d06f SHA-256: cf11f71d24dc0e617891d60e1867da240397913197ca016ed7e1b318117fec2d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-related, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points to a likely attempt to redirect the user to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=danby+designer+4.4+cu.+ft.+compact+refrigerator+manual
    • https://static.s123-cdn-static.com/uploads/4482849/normal_5fc76dedc2516.pdf
    • https://cdn-cms.f-static.net/uploads/4376372/normal_603548ae61433.pdf
    • https://cdn-cms.f-static.net/uploads/4410207/normal_606e654015425.pdf
    • https://cdn-cms.f-static.net/uploads/4467955/normal_6069791c2e00b.pdf
    • https://zunejafeg.weebly.com/uploads/1/3/4/3/134382709/zedokesofel.pdf
    • https://cdn-cms.f-static.net/uploads/4443608/normal_60176c15a2242.pdf
    • https://sevujixosatanin.weebly.com/uploads/1/3/5/3/135316334/3006410.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tazibabebamep/coreldraw_16_portable_free.pdf
    • https://uploads.strikinglycdn.com/files/bfba89b6-3200-4a16-bac7-c21909e5bcfd/programa_para_honores_ala_bandera_mes_de_enero.pdf
    • http://mirimanomuropa.rf.gd/will_a_level_exams_take_place_in_2021.pdf
    • http://dovanudoku.rf.gd/78561447327.pdf
    • https://s3.amazonaws.com/xefejevife/xugowenobulevopoveda.pdf
    • https://s3.amazonaws.com/gumagabu/84331276512.pdf
    • https://s3.amazonaws.com/bomupi/attack_on_titan_game_switch_cost.pdf
    • https://s3.amazonaws.com/tokudapele/susokelaxoratasuregutuvir.pdf
    • https://s3.amazonaws.com/lurutopobi/microsoft_excel_2013_free_download_with_product_key.pdf
    • https://uploads.strikinglycdn.com/files/a155b70d-a273-4e42-aa63-b889ffb79a07/93640400245.pdf
    • http://baxaxogi.rf.gd/13862641805.pdf
    • https://s3.amazonaws.com/mokixetat/51086291940.pdf
    • http://sezajebufixi.epizy.com/water_pollution_in_ganesh_festival_in_marathi.pdf
    • https://s3.amazonaws.com/redegelesibif/37477525755.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_off0000e21f.bin
2fe66a37fc912c1fb0e0028a5bee7d4e282700d191b07de8c202f992ba61038c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 5836 bytes
font_01_sfnt_off0000f604.bin
2ba7083aed2caef4bd39cb4aedd9b03f464e65ce7e2c89575862033406611e9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 11868 bytes

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