Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40d7379ee7cd033…

MALICIOUS

PDF

79.5 KB Created: 2021-03-15 21:19:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fb14d0cd6dbfeb6e3d15f4efb7bef5de SHA-1: b221c908e483b49ac8733f0a830ef472b3d0e8d0 SHA-256: b40d7379ee7cd03394ac9306ecb1b4a10a0793f804692d7d8deb83bbfcab0419
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/aws?utm_term=qu%25C3%25ADmica+org%25C3%25A1nica+pdf+libro PDF link annotation
    • http://medgaj.com/cmos_analog_circuit_design_tutorial0cmlz.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/hJ6tNPc/19758856894.pdfIn PDF document text
    • http://portkamesto.site/dexeresafipajigafazea2k5m.pdfIn PDF document text
    • http://vashastrahovka24.ru/117406949985f8p2.pdfIn PDF document text
    • http://joretuvivofip.22web.org/jumutivazekamuneka.pdfIn PDF document text
    • http://it50save.info/hp_photosmart_7510_printer_reviews1k1i7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_5fd2d108df197.pdfIn PDF document text
    • http://mazafaka69pussy.online/shanta_bai_song_ringtone_freeepvq7.pdfIn PDF document text
    • http://hdvideo.design/71314067977po7ki.pdfIn PDF document text
    • http://copyrightprivacy.site/ayurveda_mcq_bookselj2r.pdfIn PDF document text
    • http://how2clever.com/sekorekoberenapam6jc93.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/gnEWmpN/brawl_maker_for_brawl_stars_indir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487197/normal_5fefcd8b19668.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502511/normal_5fd85e4a628cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414848/normal_5fd386e41e89c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471083/normal_6022927d2f54f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kojajopi.epizy.com/bagutad.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/35074410139.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/62253136754.pdfIn PDF document text
    • http://bamalupit.rf.gd/what_junk_foods_are_gluten_free.pdfIn PDF document text
    • http://kotidaw.epizy.com/77613002092.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/54789072466.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_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 5788 bytes
SHA-256: c28dff6636ff48e110bab4035ed6eff0c14d8264de988998e4d61810d0900642
font_01_sfnt_off000107fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 11872 bytes
SHA-256: 203566c8f4993cdcfabb3fdfb87a7c72cda80a93777d5dbf4b60ab6eff56416a

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