Malicious PDF — malware analysis report

Static analysis result for SHA-256 06bbbe3dfe728aea…

MALICIOUS

PDF

82.5 KB Created: 2021-03-11 03:48:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: cb6b0884b9bf2c7e40cfda25301f3cba SHA-1: 3626a16cd58e0321dbcaf685a0e0a72ce64991d5 SHA-256: 06bbbe3dfe728aeaade140ef5bde138a3173cd45ce7d761049cb3cf09906c610
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, appears to be a lure related to interview questions, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=microsoft+system+administrator+interview+questions+and+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404103/normal_5fd1cef9928c9.pdfIn PDF document text
    • https://tamilavijunaw.weebly.com/uploads/1/3/4/5/134506647/f3a22f.pdfIn PDF document text
    • https://cdn.sqhk.co/jimatoju/cgd8gfj/funny_shayari_status_for_whatsapp_in_english.pdfIn PDF document text
    • http://manekobe.22web.org/bdo_guild_emblem_guide.pdfIn PDF document text
    • http://fanutoragozogow.sportsontheweb.net/86614541072.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423728/normal_5fcb397cb532f.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/5747593.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/AEgnYhg/sears_golf_bags.pdfIn PDF document text
    • http://knitfqph.site/discover_canada_citizenship_guide_audio9qsqw.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/3563028725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411511/normal_601425f4c90f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453908/normal_5fe9f4b611453.pdfIn PDF document text
    • http://nosatines.mypressonline.com/66524952253.pdfIn PDF document text
    • http://boguredu.iblogger.org/dj_songs_telugu_audio.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/dvih3Ky/ferumamimuvidunula.pdfIn PDF document text
    • http://nerroba.info/us_sba_business_plan_templateuxw3z.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/rojinam.pdfIn PDF document text
    • http://azakalaza5.xyz/86934773423q9xsq.pdfIn PDF document text
    • http://befelofote.iblogger.org/padojutozufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375525/normal_603e837ae57c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zewomasajeguzud.epizy.com/gitirerutewagi.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/kokumokigalosarudiw.pdfIn PDF document text
    • http://wujukigow.rf.gd/dawovez.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_off00010581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 5656 bytes
SHA-256: 2e17506ed04ecc7e19ef32a280d5444b14f6ac257f0a2dd194f1b67a42f9bbcb
font_01_sfnt_off000118cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CC 10348 bytes
SHA-256: 0728b8a2ed0f9c4b878f22f2cbaf843601783ebf2844f752cd7169ea81b7c541

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