Malicious PDF — malware analysis report

Static analysis result for SHA-256 86da542832136542…

MALICIOUS

PDF

78.1 KB Created: 2021-03-22 10:24:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4c2d321dfd3a1f0cdff4f945f204ee35 SHA-1: 658e3f8ad9d1b11ce2c17cdc80799b2d381f1624 SHA-256: 86da54283213654214e9f1af07a55cf5677e43794744bb6936dac7c6f5eff682
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=romeo+and+juliet+act+2+summary+worksheet PDF link annotation
    • http://devivitonewe.sportsontheweb.net/attach_files_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381321/normal_601b2a0b800b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422640/normal_5fcad21125ded.pdfIn PDF document text
    • http://xukosususif.medianewsonline.com/tobepos.pdfIn PDF document text
    • http://xivoxuvawet.iblogger.org/gynecology_case_sheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479236/normal_6006d9ad20ffe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_602d045fc0810.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/dufekifaral/kojibepeko.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/98012317062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02493313-26da-4e7f-9279-5f19bc8cd7f1/literal_equations_practice_quiz.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_2b66f760cb7343d982e529c4367871fd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/tipilerazokawezat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfca85b9-e85c-4020-a2f6-d190b34ff8da/jeep_grand_cherokee_transmission_replacement_cost.pdfIn PDF document text
    • http://xepivuze.rf.gd/python_set_range_of_list_to_value.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/teleje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb3fc65-5c0e-4b33-8908-5ac29a4c59cc/ligaxanozobareboroxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be066a7a-2852-41f7-8491-9e9a8df90508/tulevax.pdfIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_fc06d08237d647b1a0322119e337641c.pdf?index=trueIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_c4cdc18782e54565add78ca05e4529c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/fekivebubupenenuxub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c5d6cd4-75fe-4151-bbd3-9882874ec069/why_is_my_sharp_smart_tv_remote_not_working.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_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 5652 bytes
SHA-256: 657912e42256f83fec8bead7743b26d424dd51e6ec16a31ba1ad6844241d0851
font_01_sfnt_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 10804 bytes
SHA-256: 6cee80cc05ace13d68f9fdaea65c383545fdae6f1c86a7b8359e7fe1996ef1dd

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