Malicious PDF — malware analysis report

Static analysis result for SHA-256 a056bfb07e3d44ca…

MALICIOUS

PDF

69.5 KB Created: 2021-10-02 09:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46baade56a0ef36fc1e48e14d6d343de SHA-1: eb642fba61efcefc55183922521b3c938b708322 SHA-256: a056bfb07e3d44cac25377d1b58bdabe2d0e527a56082def16b35248c44233b7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous URLs, some of which point to raw IP addresses, suggesting an attempt to direct users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://imobiliariaimperio.com/files/files/gogakaf.pdf In PDF document text
    • http://baovekhucongnghiep.com/upload/files/kisafazen.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/tovipuraxevofofes.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156b013285d5---98091786938.pdfPDF link annotation
    • http://datavincity.com/uploads/ckfinder/files/vijixolemejisaz.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/71261600523.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fenunijukifirek.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/lajogajibupaxusuru.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/viwali.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/13812277489.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/94089909949.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/gokosovalekir.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/47952079231.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/84687229903.pdfIn PDF document text
    • http://taxfreepoint.com/file/21865840724.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/kisotowetuzafenak.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/85454209046.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/9312091602.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/bojofuz.pdfIn PDF document text
    • http://soupworld.de/upload/file/fomanifu.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///lomizokidaxaxepi.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/jiwazovutez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=japanese+pickled+cucumberPDF 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_off0000ae3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3A 16464 bytes
SHA-256: 0ec46301a5602cb33b2edced8e945da446625923097920870126b65875db6f7c
font_01_sfnt_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 10780 bytes
SHA-256: 73c1ef3e2c0794e1c727c5fd659e1d093e5b794befb7fbe401664b53dda3d29b
font_02_sfnt_off0000f0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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