Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b68ad8c5ccbf16…

MALICIOUS

PDF

80.8 KB Created: 2021-03-29 02:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b6ba9e42c17c61384ba5935292be2a2 SHA-1: a3e16b2264a40f823010af6abf4088a9308ea4a7 SHA-256: f4b68ad8c5ccbf16a11feb401285dbf82ff16557e07b50217a157e14f6e68dc8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=english+2+semester+1+exam+answers
    • https://cdn-cms.f-static.net/uploads/4379359/normal_605a4ec00c8a8.pdf
    • https://cdn-cms.f-static.net/uploads/4485823/normal_6019c56c5ee1e.pdf
    • https://cdn-cms.f-static.net/uploads/4367950/normal_602afd43c6979.pdf
    • https://static.s123-cdn-static.com/uploads/4496810/normal_5ff3e460aa5f4.pdf
    • https://cdn-cms.f-static.net/uploads/4382962/normal_6057fa129b1b2.pdf
    • https://cdn-cms.f-static.net/uploads/4417662/normal_605b44a52ce70.pdf
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5ff0d9dd4ce69.pdf
    • https://cdn-cms.f-static.net/uploads/4465565/normal_5fd2cf7fa4a60.pdf
    • https://cdn-cms.f-static.net/uploads/4476434/normal_6030e4cd235c2.pdf
    • https://cdn-cms.f-static.net/uploads/4382976/normal_6054d0da81ee7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://finuzajobozosom.epizy.com/wajodotivususugej.pdf
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_552d7a2a2c39465eba66826fbe9b30b3.pdf?index=true
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_d6e8576c06ea4bcda690fe7fcaa39562.pdf?index=true
    • http://zukusuvajijip.epizy.com/driver_wifi_asus_x453m_windows_10.pdf
    • http://jakezijaredu.epizy.com/file_converter_to_word_editable.pdf
    • http://kiwimodilumipov.epizy.com/94869979497.pdf
    • https://s3.amazonaws.com/zoxewudunigus/orchestral_plugin_fl_studio.pdf
    • https://cc67bef4-e22e-42fd-bf01-3f02b15f800b.filesusr.com/ugd/080020_9777dbfb52ad469faba3ae68825ca71e.pdf?index=true
    • http://rewogaki.rf.gd/aashiqui_3_full_movie_2018.pdf
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_ce4d142a82b8420c904d40984dcbe3d4.pdf?index=true
    • https://s3.amazonaws.com/xalexojaxipud/mabewigaw.pdf
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_28105df803734c3eb5bd56542f3a5705.pdf?index=true
    • 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_off0000fcfe.bin
6170f3e10b0d5150b47bda9e0f281c9dd408e35045606d46504d2a517524d874		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 5400 bytes
font_01_sfnt_off00010f4d.bin
72d4a8fb172a30d8aef3128767f311eb056e49739a2da0c9a054dc1dac662b3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4D 11356 bytes

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