Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec889eb79f83ac0…

MALICIOUS

PDF

70.1 KB Created: 2021-09-18 15:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a475a2e6ba68f14eb59e58dd32627fd3 SHA-1: e7caeb95f34533fb43682f116c38b4e37e823ab3 SHA-256: 3ec889eb79f83ac0c863ffed6d5f2201fb3e2f852d6d1a42b8cab187fe6d878f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. The presence of numerous unknown reputation URLs suggests an attempt to redirect users to potentially harmful content. Although no scripts were explicitly extracted, the PDF structure and heuristic findings point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kibledergisi.net/resimler/files/32944258834.pdf In PDF document text
    • http://eko-gospodarstwo.eu/files/file/vorodinatejasezusomilixo.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/juzapu.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/66313769060.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/63110346467.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/34521181444.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e0bc0fec2---sanibaj.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/70361596627.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/11847888854.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/nones.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/33665637613.pdfIn PDF document text
    • http://101balkon.ru/upload/files/mekarib.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/zizadoluz.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/butejibizuvove.pdfIn PDF document text
    • https://mklaassen.nl/images/file/72782657887.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/rogujaxi.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/bigegusifoveradajapo.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/92737316522.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/53847603303.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/vojoxumiter.pdfIn PDF document text
    • http://3sdent.com/upload/files/55583629954.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137cc6450063---robujawezi.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/7912779385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=use+your+phone+as+a+micPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB52 10716 bytes
SHA-256: d40eab15b727c77d332718f4017d0ca2e7f2ef3a9dbf453693186acb973ea0d7
font_02_sfnt_off0000e3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 15472 bytes
SHA-256: b9553be4d17a3885e8a8057722da0fc32414e822fbd3c832e12182e055bf3841

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