Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22fd68bb59dd847…

MALICIOUS

PDF

82.3 KB Created: 2021-03-13 19:51:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fb64420beecb61e9cd579aa2d5afe34 SHA-1: db456fdab0fbdac565695d9d517826b5a8d07dfc SHA-256: a22fd68bb59dd8479e03e5c9807cf2f67478976589bd3fc05fbf5528b0a819a3
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'bill nye heat video worksheet'. The presence of external URIs indicates an attempt to redirect the user to a malicious site, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=bill+nye+heat+video+worksheet
    • http://jekeluxuto.mywebcommunity.org/pretty_little_liars_book_set_australia.pdf
    • https://cdn-cms.f-static.net/uploads/4419194/normal_6037c4a030dab.pdf
    • https://cdn-cms.f-static.net/uploads/4417824/normal_601e7403cd040.pdf
    • https://cdn.sqhk.co/rafumufo/XhgAThh/kuzekijumigixi.pdf
    • https://cdn-cms.f-static.net/uploads/4413987/normal_600b0e3da3e9d.pdf
    • http://tagoturuluro.medianewsonline.com/bamudorowejovomatiten.pdf
    • https://static.s123-cdn-static.com/uploads/4448343/normal_5fee77022754e.pdf
    • https://cdn.sqhk.co/rewaloxuruvu/4PoRmVE/2224318706.pdf
    • https://cdn-cms.f-static.net/uploads/4451356/normal_604422847313d.pdf
    • https://cdn-cms.f-static.net/uploads/4473419/normal_603420fe18019.pdf
    • https://static.s123-cdn-static.com/uploads/4390371/normal_5fcb5c8f18fac.pdf
    • https://cdn-cms.f-static.net/uploads/4451930/normal_5fd91ba1de18d.pdf
    • https://cdn-cms.f-static.net/uploads/4409411/normal_6031df0c0e352.pdf
    • https://cdn-cms.f-static.net/uploads/4488574/normal_600aaa5ec64aa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wozoxub/jubixapejipuro.pdf
    • https://s3.amazonaws.com/vonuxagupeduze/flannel_sheets_queen_kohls.pdf
    • https://s3.amazonaws.com/donake/92422486483.pdf
    • http://resilasijajatil.myartsonline.com/sub_zero_fridge_service_message.pdf
    • https://s3.amazonaws.com/fokapikow/email_id_format_example.pdf
    • https://s3.amazonaws.com/lixuzo/53144959363.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f55a.bin
0d996a7bb7c51c817bf060824235ce439eb21f10cdd3487aa2885f8ac2e66627
pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 5068 bytes
font_01_sfnt_off00010698.bin
6312336d12fae478ea88c6899b93e236eed1a6152af1be8875028019d1592a62
pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 11368 bytes
font_02_sfnt_off00012d3f.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3F 4324 bytes