Malicious PDF — malware analysis report

Static analysis result for SHA-256 c515b6e77a36df64…

MALICIOUS

PDF

73.9 KB Created: 2021-03-11 03:20:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e57f1ebde68d8ff4a66d32e6526020a8 SHA-1: ba33656c04586dbc075cd0a4da841ff1bf417aba SHA-256: c515b6e77a36df64d10def5a369d2c5b26ad75574e9dfd8e0f121d5ea4d54eeb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to 'nipisod.ru' which is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'Against the wind chords pdf', likely to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://nipisod.ru/award?keyword=against+the+wind+chords+pdf PDF link annotation
    • https://cdn.sqhk.co/sativomofij/dgjbifx/bazidazemuwoxijuni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453344/normal_5fee10cf80d55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486367/normal_5fc7c4663f2c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426549/normal_60143b7c3d090.pdfIn PDF document text
    • https://sipovabamekejo.weebly.com/uploads/1/3/5/3/135391609/mowamumarukubiwo.pdfIn PDF document text
    • https://wubedekajonew.weebly.com/uploads/1/3/1/3/131380741/nogugojirav-kaxobozemug.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/Drt5Ehj/pacific_war_air_combat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485699/normal_602a370b991f2.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/cgcKPjc/lofumafalenunofaxidexor.pdfIn PDF document text
    • https://depatimuxuzox.weebly.com/uploads/1/3/4/4/134404048/beximirifovalu-vopexoxifide.pdfIn PDF document text
    • https://cdn.sqhk.co/biwizalibe/iWiiAny/best_natural_manicure_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_6029747dea5a6.pdfIn PDF document text
    • https://bekitatabegoze.weebly.com/uploads/1/3/0/7/130775701/kamewuwewifoxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450156/normal_5ff9b037d31a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493553/normal_603e1a74af152.pdfIn PDF document text
    • https://cdn.sqhk.co/pusobatosip/nnihfjg/wezifuxej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407571/normal_60367d336b449.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451208/normal_5fe370898715f.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/xapijifas/beach_head_game_2011_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/tubodezosetarufurepuwalo.pdfIn PDF document text
    • http://xewofikedufika.epizy.com/bofalaxovi.pdfIn PDF document text
    • http://wizugujolapalel.epizy.com/postpartum_hemorrhage_pathophysiology.pdfIn PDF document text
    • http://zilobul.rf.gd/understanding_telecommunications_business.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/rolilumuvebuwogafexudug.pdfIn PDF document text
    • http://tafimiga.epizy.com/kali_linux_commands_with_examples.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_off0000e65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65F 5468 bytes
SHA-256: 1f5a4db4e747ac52c1f64f30b9ae01b6c9f1704709f4ed36b4441e970a891220
font_01_sfnt_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 9680 bytes
SHA-256: 4a442ca16548782537b1c21788cff0d7c95612971e34c5af2cb40186056522b8

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