Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c465c1fb6d448ac…

MALICIOUS

PDF

77.9 KB Created: 2021-09-28 00:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 03674b0c38690102e7d2e1bd119d8f3d SHA-1: e4c120f2b488c32b5a49a0b7b5daf7dab048ed2c SHA-256: 1c465c1fb6d448ac4b4b70d83b375a46ae8c17dc9e397cef42b4ca426f527c5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://inwebjor.ru/uplcv?utm_term=fire+hd+8+7th+generation+android+version PDF link annotation
    • http://lobanowscy.pl/userfiles/file/44741959882.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jagudofaliwisamekibo.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/56027548646.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/zokinilazomodur.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/1654206726.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/lukuvaribixadavun.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/favifuzidasokozeba.pdfIn PDF document text
    • http://chinalabware.net/d/files/98421794658.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/goxubel.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/66510004428.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/34138861904.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/logilutedigeboxepalufaxi.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/lipebukowowexez.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/34973830454.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/xigariro.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/29085856082.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/48142720974.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/74716062861.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161427b725c90a---51526060888.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/10152303128.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/kijevazumipilukezi.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/1097905337.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://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_off0000c22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 21176 bytes
SHA-256: fadd82ef4b2e241218c2c49155b43441d1e9f7eb1ec89894dd3520ad49c9122e
font_02_sfnt_off0001117e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 10780 bytes
SHA-256: 67976b1266c26fdafda239661caaa101b0ec1a94121e174c05f16d4cd9e1dfe6

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