Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e959cff6b632d4…

MALICIOUS

PDF

74.9 KB Created: 2021-02-28 09:31:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 177b45a26849d64ac8eec01c31769b76 SHA-1: 4ac5dffbd2b369441726d3375fca33da78cb2fa6 SHA-256: 51e959cff6b632d472b8b4f64a087c8a1e1b3a5ee0df6143778689f467b642c0
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the true destination. The document body, though heavily obfuscated, suggests a lure related to product sales, aligning with phishing tactics. No scripts were extracted, but the overall structure and URL distribution indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://golowaki.ru/wb?keyword=used%20soft%20serve%20ice%20cream%20machine%20for%20sale%20in%20south%20africa PDF link annotation
    • https://cdn.sqhk.co/mexovaru/iaGjhhg/fisuzefolabakosoti.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/cibjcjf/red_boy_pizza_novato_promo_code.pdfIn PDF document text
    • http://powerpoint4you.ru/vulegexaguwuliah2.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/hJdigjg/cops_and_robbers_map_minecraft.pdfIn PDF document text
    • http://rusakova.space/nugunufividevixirepp3ynd.pdfIn PDF document text
    • http://vuzetasavuxoso.mygamesonline.org/vitesomatazuxegav.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/que_significa_el_dibujo_topografico.pdfIn PDF document text
    • http://xuzobinemipivor.mygamesonline.org/lavumeper.pdfIn PDF document text
    • https://cdn.sqhk.co/rovovuroj/agdhdbx/lightroom_mobile_presets_free_download_food.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/cjbibib/car_driving_school_game_download_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/nimuxugemu/iejaveB/pregnant_talking_cat_emma_level_31.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/17854481786.pdfIn PDF document text
    • http://mirror-x.org/2526969495243n87.pdfIn PDF document text
    • https://cdn.sqhk.co/setuboluraje/jjCFVms/knighted_meaning_in_tamil.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/my_family_and_other_animals_movie_2005.pdfIn PDF document text
    • http://milanbeach.fun/baby_gap_size_chart_shoeseuddl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zupitatip.atwebpages.com/gawazuzodowetuzixutasulod.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 5312 bytes
SHA-256: ad55142b8acd4a528cf7f8798153a3c85a7b529c60395654f623b98f2d18a555
font_01_sfnt_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 10692 bytes
SHA-256: bf5c41509ca682abfe06094dca45faa35dd63c1334d91e8883ca0043e9e3e13b

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