Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6c3e35f43d54c2…

MALICIOUS

PDF

83.3 KB Created: 2021-04-08 16:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 590267a087f4a986a365fb5052ab8e48 SHA-1: 2557670f086be5957886a0d573b4b149da0878d4 SHA-256: 8b6c3e35f43d54c25ae65ee9708e2caca6e2028a5b346cb482231ddb9b4c9b0a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the document's structure point towards a phishing or scam lure, likely using a technique similar to T1566.001 (Spearphishing Attachment) if delivered via email. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/strik?utm_term=1999+dodge+durango+transmission+problems PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481072/normal_604a889902f9c.pdfIn PDF document text
    • http://jevopapivixepe.iblogger.org/happy_birthday_wishes_funny_videos_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_601420ceb3388.pdfIn PDF document text
    • https://xedagiwaki.weebly.com/uploads/1/3/1/8/131856626/7198680.pdfIn PDF document text
    • https://powizosiki.weebly.com/uploads/1/3/4/0/134041047/30c7f3df0f1fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449614/normal_602fd9a04973a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451753/normal_5fe154ea5098c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489734/normal_600a8b268e1e6.pdfIn PDF document text
    • https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/nizorebefu_firirurad.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/85328119e33c59f.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/bitajemisajoz/tadaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e310694-5923-45ee-85eb-0ecc1a9852c9/34314521798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18bbd72a-3569-4b88-90b2-b71257825ebf/can_you_share_a_post_on_facebook_with_one_person.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/70304541068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bfc48eb-2db1-459f-b281-c0ae5941b578/50407158247.pdfIn PDF document text
    • http://zovopabipani.rf.gd/pumujugusosep.pdfIn PDF document text
    • http://pidivatepijalaw.epizy.com/liquido_amniotico_definicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1560337a-ba71-437a-9900-4b672f08189b/what_is_considered_a_voided_check.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6346c0b-6f75-4084-9e86-2dac9e4539b6/best_penny_stocks_for_2021_in_india.pdfIn PDF document text
    • http://wupitudatilag.rf.gd/gopubuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f7f9af-56e3-461c-b832-1d144f0ffc93/who_is_the_most_dangerous_prisoner.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/90460740043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/471b5fef-f9bc-4e27-9566-fb3cd580591c/17984541466.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/matlab_programming_for_engineers_chapman.pdfIn PDF document text
    • http://lajujotaxakuf.epizy.com/astigmatismo_miopia_hipermetropia.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/34249896720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae5eb59b-5d25-4fe4-83b8-2b5c944a15de/flir_c2_thermal_imaging_camera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ffadbcc-dd40-4c82-873d-45f1b8743c9e/timex_marathon_watch_turn_off_alarm.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_off0001055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 5532 bytes
SHA-256: 60a4be6a661f3d183249a371f1c6e49c8577a88a89377c69d6e56bf614ad4d8a
font_01_sfnt_off0001180e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180E 11404 bytes
SHA-256: 5084925a45da556d8d33544511b328c3c15df6fc161b9aeb68aef4706f014e81