Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbacf6f3a450a6d…

MALICIOUS

PDF

87.2 KB Created: 2021-09-08 18:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b38005cc04b3134522a7e5d54734e5d SHA-1: ca329fd22f9450131df966427bc34949a1012d76 SHA-256: bdbacf6f3a450a6d2906c839b5a535c08d997adaa9f17228c691fe9c6dbc69a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to multiple disposable domains, which is a common tactic for phishing or malware distribution. Although no scripts were extracted, the presence of numerous embedded URLs, many pointing to unknown or potentially malicious domains, supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://theorientgarden.iorderfoods.com/uploads/files/rufovavebiwidowe.pdf
    • http://homesunshinepharma.com/upload/files/69822767608.pdf
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/rerakiwe.pdf
    • http://www.benyowsky.com/resources/files/laxeroxijopinu.pdf
    • http://bellina.pl/userfiles/file/vedeg.pdf
    • https://cortopolis.ar/userfiles/file/36243564986.pdf
    • http://fernandopelosini.it/userfiles/files/luguleselitikavazosopa.pdf
    • https://relaxbotanika.cz/ckfinder/userfiles/files/61993148205.pdf
    • http://udmvdpo.ru/images/files/72143699169.pdf
    • http://deforma.it/userfiles/files/gawojakagokokuxoratalekul.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/faguwigiko.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135df7d6782a---12658924386.pdf
    • http://siciny.eu/userfiles/file/46758983272.pdf
    • http://355353.ru/userfiles/file/kibilupoz.pdf
    • http://hilimall.ae/uploads/files/kufebaxikiw.pdf
    • http://dulichtantai.com/files/uploaded/files/zipawedudovixedejisuvas.pdf
    • http://career-id.org/ckfinder/userfiles/files/zavunikaji.pdf
    • http://prosquash.by/data/28888799135.pdf
    • http://gordostcrista.ru/userfiles/file/93021027820.pdf
    • http://chaodontuonglai.vn/uploads/ck_upload/files/jekatorufulelotisu.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/gijori.pdf
    • http://casaatlantida.com/userfiles/file///vogemodibive.pdf
    • https://sfeerweter.nl/userfiles/files/10347617936.pdf
    • http://gpsputhuppally.com/userfiles/file/77262190467.pdf
    • http://1utilaje.ro/mm/file/34919598744.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ring+doorbell+camera+installation+manual
    • 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_off0000e74f.bin
20ccb8cd790723500e78b3fe0bfb176a3937cea312af2bcdb4ea6befcb179644		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 11000 bytes
font_01_sfnt_off0001009d.bin
8c1ad5f0d246f43b08b00f4a32cc04ad46b2efb0c2747576aafdd9257de76922		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 20628 bytes
font_02_sfnt_off00013659.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13659 16792 bytes

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