Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a78911fc530ce4…

MALICIOUS

PDF

79.0 KB Created: 2021-05-24 02:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 001f2cfdb01e5a0b4818896e404fa1e7 SHA-1: a8aad8092c6bc31a38203114739157e864a5e851 SHA-256: 33a78911fc530ce494da3afa0c343c8a1aa829de518a535ceb0370f17b396c4b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URL points to a domain that appears to be part of a phishing or malware distribution scheme, likely related to the lure of a free book download. No scripts were extracted, but the presence of the malicious URL and the overall classification strongly suggest a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/wb?keyword=free%20download%20pmbok%206th%20edition%20pdf%20indonesia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460461/normal_605d8b814122d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475196/normal_6050df47a5e94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409254/normal_5fedccb19ba88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467287/normal_5fc69a524ec4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454277/normal_5fe41bb0350f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462696/normal_603764803e392.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374980/normal_5ff7859a9c09e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/69539429-6f4c-4273-8671-ae4db07c606f/what_is_the_us_longest_war.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cc00547-6709-4899-a53a-b8136d37e6ec/how_to_determine_the_strongest_intermolecular_forces.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06338974-6c8e-4cb0-8c47-622cc01bb618/suncast_hose_reels_at_menards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae2b2731-cf49-4340-9bb1-27ba46c25b89/nubiloporada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bb671f6-b0f7-4f26-9fde-f8a90fc760cb/55518024652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13b49de0-1972-4b6b-9422-96a8e8f7af5d/1992_polaris_trail_boss_250_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b813e6c-d81b-44aa-b733-110e81305f48/physics_book_resnick_halliday.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/how_to_program_woods_block_heater_timer.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/8242751609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/939434ae-d200-467f-843a-2c5d2fe83376/59628035140.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/lixiwuvipubujubunireg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b27d59de-82d4-4681-bc42-af771bbdc06f/50117999489.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/vezudumurajisibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/214faa74-5c65-4fb4-996a-68e52e1efb52/44737785306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac840d52-a059-43af-b0f6-070b1a72d584/59017386511.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/57635257571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3203dde9-d326-432d-bffc-a47e44cc305a/buxadet.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_off0000f423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 5684 bytes
SHA-256: 35325905cfc6986c3ffba03f79fa831d51714bc70ef973dac14f0c053fdf3210
font_01_sfnt_off00010763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 11408 bytes
SHA-256: a2bdfd550cdf8dc1f6fea4c49746bc5343b88da54adbf4e6b2e03b1bd968706c

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