Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1abf43c7827cf1…

MALICIOUS

PDF

83.2 KB Created: 2021-03-30 10:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0b4e3ee6d01ca83e9313971383b820b SHA-1: 1898ad947cb5e583064badd66129e69ea0e72ebf SHA-256: cf1abf43c7827cf12b6bcf1199d9f434ab2fda8029b35435f4923e52f06dc478
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, containing an embedded URI pointing to a suspicious domain. The document body, though heavily obfuscated, suggests a lure related to 'domain server linux'. The presence of numerous embedded URLs indicates an attempt to redirect the user to malicious content, likely a phishing page or a further stage of malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/wix?keyword=domain+server+linux
    • http://instasale.company/22966879067up2yb.pdf
    • https://nivuvibopaxaji.weebly.com/uploads/1/3/4/5/134588818/wovomalotofovep.pdf
    • https://cdn-cms.f-static.net/uploads/4379476/normal_6017bc12186ad.pdf
    • http://onlinekartiadesi.com/epson_surecolor_p8000_review0j95v.pdf
    • http://autocredit.moscow/20359126096zm8ym.pdf
    • https://ditakusoboke.weebly.com/uploads/1/3/1/4/131437623/8590792.pdf
    • https://bozuzagon.weebly.com/uploads/1/3/4/6/134666742/wekekujigiziwul.pdf
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/bawixubanipe_wafilafexar_lamomiligi_kebiziz.pdf
    • https://wumifidadorubip.weebly.com/uploads/1/3/5/2/135298964/donedaxukif.pdf
    • https://cdn-cms.f-static.net/uploads/4420028/normal_60271402e426f.pdf
    • http://antileqphh.site/46907131588lx625.pdf
    • https://cdn-cms.f-static.net/uploads/4450632/normal_601794a6ac672.pdf
    • http://phillipen.online/tafexaslqyv.pdf
    • https://revuduxaj.weebly.com/uploads/1/3/5/3/135333309/jubivanuvilazi.pdf
    • https://static.s123-cdn-static.com/uploads/4419836/normal_5ff7784f37996.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zibumolujobebaf.rf.gd/lofigunogijeveti.pdf
    • http://jimanujomubil.epizy.com/batalusaxeruxedarifedogok.pdf
    • https://uploads.strikinglycdn.com/files/213bb688-ac88-45ee-9ffb-43a4f86d7852/niwemobozomon.pdf
    • https://uploads.strikinglycdn.com/files/a55fcae1-b7bb-4dd9-919f-495fc6402d45/earliest_pregnancy_test_brands.pdf
    • https://uploads.strikinglycdn.com/files/424066b1-9682-4ef0-9e57-7d6b79d11144/how_to_see_where_page_breaks_are_in_word.pdf
    • http://govujetimavex.epizy.com/15765029607.pdf
    • http://xivajaraseb.rf.gd/autumn_season_pics.pdf
    • https://uploads.strikinglycdn.com/files/8f62971b-2cc3-4827-ac30-328c199ba273/how_to_use_the_anglican_breviary.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109d0.bin
a8f476618aab023024c3d099f43ab0ed1b7c10ec09869733c017490ea5b100ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 4956 bytes
font_01_sfnt_off00011a9a.bin
10608036925b3e8a6eb613937db0178bb360b9ab1eaea7ec54710b8d86b12f19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9A 10952 bytes

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