Malicious PDF — malware analysis report

Static analysis result for SHA-256 a077b7d14f295d0d…

MALICIOUS

PDF

83.9 KB Created: 2021-05-22 17:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b76869dbed41f9a8132266089e45dd9b SHA-1: 57a9ba65a7529eda34324829c4b6c893054069d5 SHA-256: a077b7d14f295d0db888ab39545bf2dbae930e1f4fd18eb833634c9a0d6057ed
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to the domain 'fokemale.ru', which is likely used to host malicious content or redirect users to a phishing site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URIs indicates an attempt to direct the user to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://fokemale.ru/strik?utm_term=age+of+empires+2+civilizations+ranked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490133/normal_6064d1dbe2c6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391921/normal_5ff1786838662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384152/normal_602365967b228.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454051/normal_60027b51550f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403807/normal_6047674f2fe3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sabegokek/report_writing_contents_page_example.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/how_to_change_adt_door_code.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/riruvomajosowamefawoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1260d746-2358-4449-bcff-9b42cca588f2/10653982662.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/79198114616.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/exame_de_cariotipo.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/22238248293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b863c2e4-ab4a-4b36-a589-83d3109b3faa/7165179054.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/14728813893.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/de_forma_altruista_que_significa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95d0d6a1-2c05-43bd-a05e-5b217757655c/how_to_open_sms_peeper_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bc9647c-133d-4f03-9ca3-f2a633f181e9/the_5th_wave_chapter_4_summary.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 5560 bytes
SHA-256: c0d004ed00801aeb04dfdca129eabac2417a1841867b4ac920e50b637fe5c878
font_01_sfnt_off00010f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F02 11064 bytes
SHA-256: ed7bbdfcfff0f2a4f56e50c0d8f472f1569ed6a0872556d6e78e5c0b7729c6f3
font_02_sfnt_off0001348e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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