Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91072f891f170d8…

MALICIOUS

PDF

71.7 KB Created: 2021-02-22 07:06:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4bd383785a4fba73932fa5ec18d9bbd0 SHA-1: fcb545be07754adee91149863c65f3b463cb24ab SHA-256: a91072f891f170d8f10ba6c00746ec3f44e80b4a0964c46b4b7a95467f453215
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to a suspicious domain, likely intended to trick the user into visiting a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to a medical topic, which is a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=hypo+and+hypersecretion+of+hypothalamus PDF link annotation
    • https://nanuleseja.weebly.com/uploads/1/3/4/0/134012971/ac5732e0da.pdfIn PDF document text
    • http://vekvelo.ru/70995892142zk3jw.pdfIn PDF document text
    • http://trend-sales.fun/30752954972b85b7.pdfIn PDF document text
    • http://limaxinsto.xyz/budget_spreadsheet_in_excel_free7uhs2.pdfIn PDF document text
    • https://nulupuro.weebly.com/uploads/1/3/4/5/134596779/tiruxopegi.pdfIn PDF document text
    • http://drive4mclaneaustell.com/vigesifizuzelaxejosele6gvhr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386335/normal_5fe409942a2fe.pdfIn PDF document text
    • https://cdn.sqhk.co/mojikeke/ghtjfje/ditemef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414689/normal_5feb5f880f97f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375890/normal_5fcaed4e41118.pdfIn PDF document text
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/lawekakodovi_penem_rogugadabujitew.pdfIn PDF document text
    • https://kuwodugedo.weebly.com/uploads/1/3/0/7/130739904/dujufapix.pdfIn PDF document text
    • https://jukatuve.weebly.com/uploads/1/3/2/7/132741058/weperu_wujepiseze_pojamopinivus_xuwafovudaxula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382638/normal_60062b479c134.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/wupixufekijax/zobinevefizev.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/64824667002.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/how_do_i_see_blocked_numbers_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/gevupu.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/16244347831.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/whatsapp_status_sad_female.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/6585670631.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_off0000dbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF9 5456 bytes
SHA-256: 91e51b1a152d8298ddb83bc69e3655320d6d37567f87b38ccc32bb1e068893a9
font_01_sfnt_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 10144 bytes
SHA-256: 52e466f1d40170197de75de573022351daf06cc62cb3ea69e2741207ec52ac81

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