Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0ff0786875bb9e…

MALICIOUS

PDF

73.0 KB Created: 2021-09-14 10:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 0181569a6bf82b8e07b558c75eb4543d SHA-1: 53df4869fde661d2dd40ad9bfe39afe898be19ea SHA-256: 6c0ff0786875bb9eb891421597d3b8597d88de2726ee4f264467f90705563a7e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URIs, many of which point to disposable hosting and form a link farm, a common tactic for phishing or distributing further malware. One URI directly uses an IP address, indicating a lack of effort to obscure the destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://zahidnawaz.com/UploadedImages/image/zinidamosonosonokeveluso.pdf In PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/47477783074.pdfIn PDF document text
    • http://minhanh.com/files/54400133969.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/51712108771.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/nirupupuxovoz.pdfIn PDF document text
    • http://furniture83.com/upload/files/tivej.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/38954873043.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/wijipubojowixexitidito.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/werisomupeju.pdfIn PDF document text
    • https://stvorki.ru/files/file/8499755415.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/52715918652.pdfPDF link annotation
    • http://thebankcardservices.com/uploads/files/83220346371.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/tazosa.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/7469213098.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/gunagujap.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/64364766186.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vutunemafujasib.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/nedelerifukufa.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/guxopadi.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210903070138.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/gepiru.pdfIn PDF document text
    • https://netpage.info/userfiles/file/75087895580.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/nusigarisexutikerifozozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=icse+class+10+biology+practical+book+pdfPDF 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_off0000b979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD190 11160 bytes
SHA-256: 9892ce4f1e7ce2d708570c01f581d56b20692158aa8ee775aff322cbcaf89645
font_02_sfnt_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 16516 bytes
SHA-256: 2a1eb1fddab0b019f2e955d1f98e5784df45f56aced10405bf48f414fce84a49