Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0a90250fd18510…

MALICIOUS

PDF

81.2 KB Created: 2021-02-25 13:13:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8e330aa41f616bf3cf2322f5e6a4bf96 SHA-1: 41027e899a606e4c0434950e1461af4a8c4d24bf SHA-256: bc0a90250fd1851080ee3904e3cecbb9d50f87c9a33ef88fc18c33b9012e1d97
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to a game and uses wkhtmltopdf, suggesting a lure to external content. Numerous URLs are embedded, pointing to various PDF files hosted on disposable domains, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wix?keyword=play+don%2527t+whack+your+boss+with+superpowers PDF link annotation
    • http://cardio-active.site/dutonowomuweromumun9w76.pdfIn PDF document text
    • https://jagamasukibo.weebly.com/uploads/1/3/4/4/134493784/7074102.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386839/normal_5fca97e008f32.pdfIn PDF document text
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/2ef10d853d0a.pdfIn PDF document text
    • https://cdn.sqhk.co/pananele/gh7noje/kenixolupoz.pdfIn PDF document text
    • https://cdn.sqhk.co/rinilafexowi/gdfge8l/3581742015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421062/normal_601f118c7e86d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_60360525f0dec.pdfIn PDF document text
    • http://nezesepibakow.iblogger.org/58862635105.pdfIn PDF document text
    • http://itfamily.info/bahubali_1_video_songs_in_tamillz9fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448103/normal_5ff4e13b810a7.pdfIn PDF document text
    • http://hayatevesigar.online/xobemuzunutageluwowuzxn0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383689/normal_5ff287a9192ec.pdfIn PDF document text
    • http://mgacessoria.online/19854587269sfh25.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/Ygfoegj/tetupa.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://xeduniramabal.rf.gd/33790598926.pdfIn PDF document text
    • http://sofidubanelen.epizy.com/nortel_m3904_telephone.pdfIn PDF document text
    • http://zilajib.epizy.com/remarkable_tablet_templates.pdfIn PDF document text
    • http://demezokesude.rf.gd/living_air_purifier.pdfIn PDF document text
    • http://vobununebufipu.rf.gd/dasalujogipifarizikux.pdfIn PDF document text
    • http://lizomepikoxi.epizy.com/dagodumunugaboratewenof.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_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 5476 bytes
SHA-256: 0871b171b57a540e7e400efa5089ee6d2d2c7938239a7639fe6e420a68b3c84f
font_01_sfnt_off0001030a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 11164 bytes
SHA-256: b27bb064b90c00b1c40da172b4159fed51d26d8c05c17dcb518a84b5792a9fec
font_02_sfnt_off00012938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12938 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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