Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4d468445974f25…

MALICIOUS

PDF

80.0 KB Created: 2021-04-07 03:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: be929f34bf8ff2e8bd30057088accee7 SHA-1: 210953b273e0df48987389d66cc21e2b84bb9368 SHA-256: aa4d468445974f25a5962bb9a1a79b6774eb8d5064d8e8df98c4f17ee1596b26
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'The odyssey graphic novel study guide' and 'wkhtmltopdf', likely serving as a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://baarspo.ru/strik?utm_term=the+odyssey+graphic+novel+study+guide PDF link annotation
    • https://cdn.sqhk.co/doparibi/exaKcNy/88393763853.pdfIn PDF document text
    • https://gonuvogizup.weebly.com/uploads/1/3/1/8/131857562/dosijexexaviba-nejodep.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/how_much_do_air_conditioning_mechanics_make_an_hour.pdfIn PDF document text
    • http://eeeeeyyy.space/buseginafoxojjsehs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425484/normal_6066b1c31dd50.pdfIn PDF document text
    • https://gidiwukos.weebly.com/uploads/1/3/1/3/131381706/rugofima.pdfIn PDF document text
    • http://luminar3-download.xyz/cursed_armor_walkthrough_guide3mxhe.pdfIn PDF document text
    • https://mamasikixatok.weebly.com/uploads/1/3/5/9/135961158/jokawafilowires.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387819/normal_6026ac71a3674.pdfIn PDF document text
    • https://xepinepuro.weebly.com/uploads/1/3/0/9/130969238/fefazezafavo.pdfIn PDF document text
    • https://cdn.sqhk.co/gesaxamadew/jrdJhaI/pappu_curry_ela_cheyali.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/rabudalavizaxom-verumef-daselawatenazu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404959/normal_5ffd205c1704c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405946/normal_606c62692b1b1.pdfIn PDF document text
    • https://warejavusa.weebly.com/uploads/1/3/4/0/134017768/nekofume-depibobu.pdfIn PDF document text
    • http://kawasus.scienceontheweb.net/wupamirizetadawarezupep.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/gupelafuzixivafubiv.pdfIn PDF document text
    • http://antinomi.design/durogomavakanozusuz48d6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_603cb701de6f3.pdfIn PDF document text
    • http://it50discount.pro/17848640143n4oqy.pdfIn PDF document text
    • https://jorevubo.weebly.com/uploads/1/3/4/8/134869484/naguxosuzokixat_mavelapeg_jixezob.pdfIn PDF document text
    • http://proba7.xyz/notezetucppxr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://movuzawizigevej.myartsonline.com/random_forest_algorithm_in_machine_learning.pdfIn PDF document text
    • http://gakajitaju.atwebpages.com/tiroxoti.pdfIn PDF document text
    • http://domebiwek.myartsonline.com/depression_signs_and_symptoms.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 5328 bytes
SHA-256: 05ed21fe508f2069753a213b4e6dbe2386ceae18ce1d806a45b93aea8485ab59
font_01_sfnt_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 10576 bytes
SHA-256: e0a28fcff7fd4644e09c3d7b1d6a73ac5e55ed3ab5157fab595e2047b1b87253
font_02_sfnt_off00012456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12456 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c