Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51c9b1cb5f230cc…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 20:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b56dfdd22c687337acfefb726563a89 SHA-1: 8c834d7cf983053f3f90209fbd07ecd2662b281b SHA-256: a51c9b1cb5f230cccfc6b03c13351abca2079be95cb104c7aebb4b7bedad393a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host numerous links to potentially malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://ciccioinpentola.com/userfiles/files/gamalubokofajatitaso.pdf
    • https://ist-lb1.istanajp.com/contents/files/56224558714.pdf
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/8251700928.pdf
    • http://nhahanghienminh68.com/upload/files/50069619957.pdf
    • https://implantsdentairesdesmoulins.com/upload/editor/file/62951775908.pdf
    • http://kleiberit.ru/files/file/43743017934.pdf
    • http://pk-rowery.pl/user_pict/file/mebej.pdf
    • https://amrapalispot.com/userfiles/file/kovuwuxadolakek.pdf
    • http://massvt.sk/editor_uploads/system/files/93334007609.pdf
    • https://coherence.cz/userfiles/file/15887503505.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/f141a2083a90639088bc3d78e22943b9/12879398504.pdf
    • http://karpatskiles.ru/store/file/pifonoxok.pdf
    • https://rainbowfurnitures.com/files/files/fezamiba.pdf
    • https://takitech.hu/userfiles/file/91636350738.pdf
    • http://hmsendo.pl/uploads/editor/file/sibebebijonafizifom.pdf
    • http://kaztelcom.kz/ckfinder/userfiles/files/10367565075.pdf
    • https://groupunsur3.com/contents/files/vafuvazodidinumom.pdf
    • http://another-partner.morefriendship.com/upload/files/28134797424.pdf
    • http://pathtojanna.com/userfiles/files/mavukuwojofar.pdf
    • https://mcdelandes.ca/uploads/file/wadekubakutanirizavil.pdf
    • http://enotecagaribaldi.it/userfiles/files/80294329427.pdf
    • https://unique-u.biz/images/uploads/file/jojepuxagevidilegonuwikiw.pdf
    • https://masihpt1.com/contents/files/zotokuvexefuxiw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=spanish+phonetic+alphabet+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 16792 bytes
font_01_sfnt_off0000f448.bin
6a76f33f7cb18cc0bb32fda8f5a2a09ef4eade695edc5064bca2d0ee793576ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 21308 bytes
font_02_sfnt_off00012c1b.bin
800e80dc2a91404453d401f48cf584761d660b535496c079d0091bbe348a35eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1B 10832 bytes

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