Malicious PDF — malware analysis report

Static analysis result for SHA-256 910cc1a234fa70c8…

MALICIOUS

PDF

84.3 KB Created: 2021-04-06 19:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 37f6b353449e5c95a7af5ea1635441f4 SHA-1: 3cfdb9e17114f8820f1d80cdb7193142a2d1c71a SHA-256: 910cc1a234fa70c84c441d4f7ada324117d2309080e4f92d01a20474698ded0d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/123?utm_term=beginners+guide+to+kipping+pull+up PDF link annotation
    • https://cdn.sqhk.co/tamupoto/egckjar/masagexug.pdfIn PDF document text
    • http://nazhivy.net/56275648373ayl1x.pdfIn PDF document text
    • https://wokulenazaxur.weebly.com/uploads/1/3/4/7/134744474/f4fc367f868.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/raxujujewil.pdfIn PDF document text
    • http://hyipinvest.site/healthy_diet_foods_fitness_help_apple1wwlm.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufojigox/ijigDhg/xerumiwe.pdfIn PDF document text
    • http://copyrightram.net/tango_charlie_movie_ringtone41tec.pdfIn PDF document text
    • https://cdn.sqhk.co/minutakumu/jI8qhfT/canon_700d_specifications.pdfIn PDF document text
    • http://nebemor.mywebcommunity.org/acurite_weather_station_with_large_color_display.pdfIn PDF document text
    • http://somixewavado.sportsontheweb.net/28232271715.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/kuzovasefusumam.pdfIn PDF document text
    • http://habercigo.com/ge_turntable_microwave_oven_stainless_steelkvnyf.pdfIn PDF document text
    • https://jerolukemotib.weebly.com/uploads/1/3/0/8/130874115/momilovutoja-sabavalipumozo-nixokasovosule.pdfIn PDF document text
    • http://reduslimitaly.website/how_to_build_chest_muscles_with_resistance_bandsjpy38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/naxizugenabi/66376067012.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/kelemixopap.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 4912 bytes
SHA-256: c1b536bdb4824f9c62ee9e29f24248d64ad08156bd90d1fa154f0213e48be533
font_01_sfnt_off00010e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7B 11016 bytes
SHA-256: 80ffca4e4159749cbc24622af5fb59ab0dc8739b2a8338d0eb098d3fb2dd9ac8
font_02_sfnt_off00013429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13429 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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