Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ab516f1d9a17ff…

MALICIOUS

PDF

84.3 KB Created: 2021-03-23 13:05:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f540974347f35aa4edf970f8d7c2bfb SHA-1: b029e429914af9bcbc95ef3c05ebfe6d3165b272 SHA-256: d5ab516f1d9a17ff848f488ecad452f024cf49f01a08065031bc75de6a7b1904
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common technique for SEO poisoning or phishing, with one prominent link pointing to 'ponafet.ru'. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs and the heuristic firings strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/wix?keyword=dan+pink+to+sell+is+human+pdf
    • http://podenepusow.22web.org/farijebusima.pdf
    • http://save50it.pro/very_low_carbohydrate_ketogenic_diet5auia.pdf
    • http://libralab.digital/wofurirogez6qdm.pdf
    • http://jekebes.iblogger.org/baaghi_movie_video_full_hd.pdf
    • https://cdn.sqhk.co/fowoleleda/gjheUhb/61161354924.pdf
    • https://cdn.sqhk.co/zexupibo/hJZvdtJ/31429431982.pdf
    • http://copyrightsupportforlnstagram.com/managerial_accounting_garrisonw3v17.pdf
    • http://lnstagramcopyrighthelps.com/how_much_can_a_2015_lexus_rx_350_towc6qqn.pdf
    • http://idealica-italiauficiale.website/dichotomous_key_worksheetxxvl6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dc1520a0-2b6a-4004-ab1a-5afd2fdb058d/smoky_mountain_series_smoker_charcoal.pdf
    • https://uploads.strikinglycdn.com/files/edd73573-d4fd-4067-8c56-7043b2450bed/graphing_inequalities_practice_sheets.pdf
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_e6bd807c893b4beeaa1f6ba34730da2f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/831585ac-322b-4751-b54e-b97e295023ba/94810149201.pdf
    • https://uploads.strikinglycdn.com/files/2f16e885-c85f-4ea9-8c96-5644294175ff/staples_canada_shredder_bags.pdf
    • https://s3.amazonaws.com/fixararololu/cbse_class_7_maths_rational_numbers_worksheet.pdf
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_c3bccf8d77f3406bb6d6cc0d16c4e8bc.pdf?index=true
    • https://s3.amazonaws.com/zepifudoxapo/facebook_video_er_android_github.pdf
    • http://guziruxasa.epizy.com/popekenutavenadin.pdf
    • https://s3.amazonaws.com/gekixadonuru/mobijadumaravozanasike.pdf
    • http://bojonovesigeno.rf.gd/learn_french_grammar_through_english.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010de4.bin
6c1da11a1d648f0c4de62a3b576bb3815a14b0c691e9976b5d8097f932242eb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE4 5248 bytes
font_01_sfnt_off00011fa3.bin
e4225f2e4ff5d7e9274b99f238e66a284f2f76d6d72f08a2dff9cabf64ac018d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA3 10620 bytes

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