Malicious PDF — malware analysis report

Static analysis result for SHA-256 2525b340500f7ed3…

MALICIOUS

PDF

94.3 KB Created: 2021-09-19 09:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3169e00df80bafdcfb8110ea4ddabd81 SHA-1: 237a4df8ee3d660adf26e10d4f667e2e4f1b3632 SHA-256: 2525b340500f7ed3db087d72102f2ceb74f5a606194b24302554a141d72c764b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_RANDOM_URL_LINK' specifically points to a suspicious PDF hosted on a domain that is likely part of a malicious infrastructure. The ClamAV detection and ML classifier further support the malicious nature of this file, indicating it is likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/juvifo.pdf
    • http://medicamarsala.it/userfiles/files/xivalibisuxojavorozesade.pdf
    • http://corporatiegids.nl/uploads/files/zidezufobo.pdf
    • http://phanphoiongnhuahoasen.vn/upload/files/fokifixexipuwedivuligojul.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/jatib.pdf
    • https://zegaoyun.com/calisma2/files/uploads/dawuluzalepixat.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/52e7f6e9a2fd0b0255e99d9c551e037e/60879171801.pdf
    • https://khmernative-rice.com/userfiles/file/71370984494.pdf
    • https://aordonez.com/images/contenidos/files/22588857257.pdf
    • http://mariautonoleggiomarsala.it/userfiles/files/loniros.pdf
    • http://sten.kr/club/data/userfiles/file/20210910092049.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/38hq3k8dso745cepv55h53vb51/fetovabozibumof.pdf
    • https://dintek.eu/uploads/file/88141182947.pdf
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/pinilozozorinag.pdf
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/karulidiraralubusavaned.pdf
    • http://minhledtran.com/luutru/files/wotamuguvabatekasot.pdf
    • https://bangvetthuong.com/luutru/files/xitujarevox.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/bogosebovafonavawifup.pdf
    • https://kakakmanis.com/contents/files/96252923498.pdf
    • http://hitmet.slektenkaas.com/bilder/file/fewogunojatutiruj.pdf
    • http://1night2day.com/ckupload/files/vakesudanedil.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+essential+hr+handbook+pdf+free+download
    • 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_off000102da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 16792 bytes
font_01_sfnt_off00011af1.bin
8c27968a014a46449dbd0ed11f60bfbc4a2a5e721c108064c2b38fad50140a49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 10876 bytes
font_02_sfnt_off000133d5.bin
5261d42519ae1385f907c08cf4e24d53615fbae146b902ba845bca59d85453d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133D5 21500 bytes

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