Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b8e8b890ed2e9e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 18:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9aa81f55ebfd7a98ab3ab23a48a56c97 SHA-1: 216885b88745cc08d487b615924f2dee3c982499 SHA-256: 34b8e8b890ed2e9e9ac478d6e764d9a83e914a66d2e8a87c529cd503dce819b6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, with one pointing directly to an IP address, indicating a phishing or redirection attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests it's part of a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://afma.pt/site/upload/file/nakexiwusidajukejewur.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140372f49d5f---83341923326.pdf
    • http://185.33.116.145/~acus01/upload/files/87815523561.pdf
    • https://iaido-iaijutsu.ru/userfiles_exc/duzamazivu.pdf
    • http://beamstraffic.ae/amb/userfiles/file/nozexelalirumewi.pdf
    • http://slstudio.it/userfiles/files/fomimesejoxekelamidavuju.pdf
    • http://harlit.com/ckfinder/userfiles/files/20210914_034552.pdf
    • http://lexxyin.net/files/fckeditor/file/96373473601.pdf
    • http://dighakanchaninternational.com/FCKeditor/file/fevaxefebonosedutedot.pdf
    • https://supermagnum-bg.com/ckfinder/userfiles/files/6948147734.pdf
    • http://www.tahi.hu/ckfinder/userfiles/files/mewiv.pdf
    • http://chochosanencino.com/uploads/files/56602285625.pdf
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/powasefoxovafanu.pdf
    • https://thehouseproduction.net/file/45877793296.pdf
    • https://parvazyab.com/basefile/api203/files/tolafafujovedarip.pdf
    • http://mos-craciun-inchiriere.ro/fckfiles/file/vasexefoxoxinava.pdf
    • http://musclecar-taps.com/js/upload/files/54001427959.pdf
    • https://relans-nn.ru/images/docs/file/48154063380.pdf
    • http://laxycoffee.com/upload/files/wajalilevawoket.pdf
    • http://bioaec.com/userfiles/files/wuminagusanoxixoku.pdf
    • https://paradigma.bg/uf/file/sopemirazitikagid.pdf
    • http://signauction.net/userfiles/file/nixoba.pdf
    • https://goldenlinejsc.com/userfiles/file/talezotegozukumixaxuvez.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gandi+baat+5+online+watch
    • 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_off0000d826.bin
844a7cd437e2829f00edba3385b1fdfcc68f38bce12be9dbdb8480dad2dbb210		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 10600 bytes
font_01_sfnt_off0000f059.bin
b657d979e256f7a314b7ca1f09edd75d34de0529757e60626aac7e617973b4ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 17876 bytes
font_02_sfnt_off00011ea9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 16792 bytes

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