Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc99e5ee1eec790b…

MALICIOUS

PDF

77.7 KB Created: 2021-04-08 19:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ffc782507513eff60ecaf856d1526396 SHA-1: 591d58c32b188751a08a445a9d23f84947113823 SHA-256: bc99e5ee1eec790bc708f329cbf9e079252a9afbc7be1682c5d60253e3aab5ba
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an external URI pointing to a suspicious domain, and the ML classifier flagged it as malicious. The document body, though heavily obfuscated, appears to be a lure related to a search query. The embedded URL is likely intended to lead the user to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/strik?utm_term=what+is+the+texas+sales+tax+rate+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421934/normal_5ff3b5a978cf9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427528/normal_5febdda1ba596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_603ef058af375.pdfIn PDF document text
    • https://natulawud.weebly.com/uploads/1/3/4/3/134309077/jajodobevalaro_miwidafefi.pdfIn PDF document text
    • https://fezivalolir.weebly.com/uploads/1/3/4/4/134461714/lagimaxeso-wodapadi-dixexeroveki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473963/normal_6032cc119f8f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471230/normal_601ce5b87de78.pdfIn PDF document text
    • https://vakitisize.weebly.com/uploads/1/3/4/0/134017930/b651800f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475586/normal_5fe50e95e6372.pdfIn PDF document text
    • https://masodorenos.weebly.com/uploads/1/3/0/9/130969057/dasenofetaxibavidiv.pdfIn PDF document text
    • https://nedovena.weebly.com/uploads/1/3/4/5/134528917/3398013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_602a9ec4d88a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408479/normal_60326a883662e.pdfIn PDF document text
    • http://mivegik.mygamesonline.org/greenhouse_effect_in_bengali.pdfIn PDF document text
    • https://bafejaligaxe.weebly.com/uploads/1/3/4/0/134018432/02c5de7.pdfIn PDF document text
    • https://xigizimevavas.weebly.com/uploads/1/3/5/9/135982966/4106994.pdfIn PDF document text
    • https://ramoxibe.weebly.com/uploads/1/3/1/6/131636726/gigobipalejizip-dalixajidi-jiradot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464709/normal_606c95151c0f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zonurupadul.atwebpages.com/bingo_card_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/tewoku.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/binomial_expansion_negative_power_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/what_is_the_most_popular_german_shepherd_dog_name.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/dhol_baje_re_gamit_song.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/brche_klammern.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_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 5128 bytes
SHA-256: 4e760a263074422e796a32512e3728a4528dae530791c3e43003285d74f18289
font_01_sfnt_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 10904 bytes
SHA-256: da08817d997ed2beeb3c46d9d78b7bb2ff00f034924284a89281f14b3555a65b

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