Malicious PDF — malware analysis report

Static analysis result for SHA-256 058c6ff513079b43…

MALICIOUS

PDF

73.2 KB Created: 2021-03-11 23:39:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3161e39e915b9b8007ddafae41ebea48 SHA-1: 7b80c4c2895aa3410e3e3f7f71eee6b62696ec9d SHA-256: 058c6ff513079b433b34b596a1acb4e1cf3305d2769a84046922f72116e1a0e3
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://maypoin.ru/123?utm_term=a+c+r+form
    • http://komarovskii.xyz/how_long_does_graco_nautilus_lastmsxa5.pdf
    • http://kerufeki.22web.org/revupozegiv.pdf
    • http://tijudozi.scienceontheweb.net/net_sales_divided_by_average_total_assets_is_equal_to_the.pdf
    • https://xajevopo.weebly.com/uploads/1/3/2/6/132682124/fasibaxumi_xuvovinuxewopi.pdf
    • http://wiwexar.22web.org/second_hand_law_textbooks_for_sale.pdf
    • http://wapotod.22web.org/diversity_in_living_organisms_answers.pdf
    • https://ziruxirunilexa.weebly.com/uploads/1/3/0/7/130775543/9153505.pdf
    • http://art-practice.org/early_voting_presidential_election_2020_resultst6e6v.pdf
    • http://erethiztzj.space/rowetupojvn1.pdf
    • http://ceter.xyz/yoga_pose_cards_printablevacir.pdf
    • http://xusegerobexusag.iblogger.org/dezuxi.pdf
    • http://intereriia.com/soxamemamivubin8tcn6.pdf
    • http://instacopyrightcenter.com/jamogivopasenobadofutwqb.pdf
    • http://rimka.xyz/901533683043hhd1.pdf
    • https://zurejekivob.weebly.com/uploads/1/3/0/8/130813755/4714045.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://paguxesij.myartsonline.com/wozepunidazemusef.pdf
    • https://uploads.strikinglycdn.com/files/213e6d6b-2bbe-4d1c-a2ea-3de6796aab98/19212631039.pdf
    • https://uploads.strikinglycdn.com/files/5b30ccd4-31b3-4e00-9832-a9d73e723352/florida_real_estate_test_review.pdf
    • http://rapuxatidugek.epizy.com/samsung_galaxy_tab_s3_android_9_update.pdf
    • https://uploads.strikinglycdn.com/files/fcb847ce-770f-430d-8b6d-7f7c86a418f1/30538236019.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_off0000e137.bin
fc92cc1edaa941a8054821e36cbfc867891723af6976ff7b95e11ae34da6ad81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 4596 bytes
font_01_sfnt_off0000f0ca.bin
24c5f77cde2dda4f3b8678bd944c2bb934ca4a3dc1df5ef97a34effee95ec848		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 11188 bytes

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