Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a2e35bb7141d39…

MALICIOUS

PDF

76.8 KB Created: 2021-05-24 23:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6281bb0ecea14cd123e0379a81d17213 SHA-1: ee4d6789f9add5e48fbc72d1088107a6b962bf31 SHA-256: 31a2e35bb7141d3986a2d3b312d9e1f8a5e1f71a8d788495d4fac7c5cf69a57f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a large number of external links, specifically a PDF link farm, suggests an attempt to direct users to potentially harmful websites. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, which could be used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=cyberflix+tv+freezing PDF link annotation
    • https://sewatebemadog.weebly.com/uploads/1/3/1/1/131164437/2188146.pdfIn PDF document text
    • https://bigakobavivab.weebly.com/uploads/1/3/4/7/134747120/jowegamojuni-lekumunumut.pdfIn PDF document text
    • https://mokadipubozot.weebly.com/uploads/1/3/2/3/132303064/5057761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_605d9c1f06364.pdfIn PDF document text
    • https://depopuxa.weebly.com/uploads/1/3/4/8/134893869/75499d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_605586cc72ea5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401976/normal_60067fe1e7e32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_602c1479ccce2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393790/normal_601850ef90862.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/interview_questions_for_managers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51fe85a2-741c-45f4-af15-03b558a7b242/70596457187.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/kung_fu_hustle_english_dub_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/bissell_proheat_12_amp_belt_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/how_to_make_a_bar_graph_in_excel_using_data.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/bowflex_treadclimber_3000_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c650bdff-2c16-4243-a2b8-647715683989/muvozuravewidesekevel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67498934-1309-4b45-844f-2dca3e5b2979/public_speaking_how_to_speech_topics.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/livro_harry_potter_e_a_cmara_secreta_-_edio_especial_ilustrada.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/benefits_of_information_technology_in_agriculture.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 4872 bytes
SHA-256: 36cae626378b4b28aa94bda983ca05eeae3cf42ff4edb6c9d89fcaaf6fab1c7f
font_01_sfnt_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 11436 bytes
SHA-256: 41cdc775d1ade8189b49a6db76f94ec614335e8bc5b630b2d52a9d23ac2531b4

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