Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2fbfd936be742f6…

MALICIOUS

PDF

78.1 KB Created: 2021-04-19 02:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ed2800977035e3cf5448fc0e03e03aa SHA-1: 69a7f9eb2bc27ade45bcb3074528efce87a7d3f5 SHA-256: d2fbfd936be742f64e61ea836d5ef89728089f6e4b80f1b3b7193a42dabde473
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files on different domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=has+a+series+of+unfortunate+events+finished
    • http://rijigikesezaga.mypressonline.com/angle_between_two_lines.pdf
    • http://jabewes.medianewsonline.com/91849214135.pdf
    • https://cdn-cms.f-static.net/uploads/4465274/normal_5fe76f089f0c5.pdf
    • https://wefikugozakilo.weebly.com/uploads/1/3/1/0/131069992/valekunaxula.pdf
    • http://vedivux.mygamesonline.org/what_is_mean_median_mode_explain_with_example.pdf
    • http://vaxiliwu.medianewsonline.com/dyson_big_ball_vacuum_parts.pdf
    • https://cdn-cms.f-static.net/uploads/4446497/normal_601dd9e82f63b.pdf
    • https://static.s123-cdn-static.com/uploads/4389084/normal_5ff7735ce6f2a.pdf
    • http://gosoxegekiri.mywebcommunity.org/senejo.pdf
    • https://cdn-cms.f-static.net/uploads/4465249/normal_603433a0402a2.pdf
    • https://xidazujagavoza.weebly.com/uploads/1/3/1/4/131453269/ca07d419d.pdf
    • https://cdn-cms.f-static.net/uploads/4501965/normal_603220f0e9334.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tazibabebamep/wiwivifelok.pdf
    • https://s3.amazonaws.com/senodiw/tom_clancy_jack_ryan_universe_books_in_order.pdf
    • https://uploads.strikinglycdn.com/files/9dfbf1d3-0562-44f3-a1e3-8a44b908a21e/breckwell_pellet_stove_p22.pdf
    • https://s3.amazonaws.com/xisefowu/ramiwefabizonijifikofej.pdf
    • https://s3.amazonaws.com/rafiralexezol/practice_test_1_book_3_math_answers.pdf
    • https://s3.amazonaws.com/vatosolikijike/jexemedonakawexuxuxuwodu.pdf
    • https://uploads.strikinglycdn.com/files/80d43ebf-c005-4354-bd85-2457a5ae4718/strategic_marketing_management_by_philip_kotler_free_download.pdf
    • https://s3.amazonaws.com/dudujopixejikug/how_to_use_imovie_to_make_youtube_videos.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_off0000f3fa.bin
c117c0461ca5976868e97ba46b4189851a05aef3b98438fe6db33830c408ab2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 4984 bytes
font_01_sfnt_off000104e8.bin
8d317bdefe996deb037962e02739eb71391b3339f0337ca0c185400b44471ff3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 10640 bytes

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