Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc61d2323e69e6f1…

MALICIOUS

PDF

79.4 KB Created: 2021-05-15 00:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3c847d699216d20d652903cf9d8701ae SHA-1: 2e7747a48260b7cf33a0af869e15369209605af5 SHA-256: cc61d2323e69e6f195134a14fe0d2c42e0b6652cb566cbdb2919aa51f47d4fec
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirectors or link farms, indicating a phishing or spamming campaign. The primary malicious URL identified is https://dafemum.ru/strik. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=bella+12+cup+coffee+maker+replacement+carafe In PDF document text
    • https://cdn.sqhk.co/zabitokepum/DEbighh/only_one_you_book_read_aloud.pdfIn PDF document text
    • https://cdn.sqhk.co/pobumepova/miaghsA/30541558754.pdfIn PDF document text
    • https://cdn.sqhk.co/kozutani/Fwiaia5/13206766518.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/fallout_4_bethesda_mods_not_ing.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_d109d98ccd5d4c81a4e04312bed5b723.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/can_dilation_be_negative.pdfIn PDF document text
    • http://rumusajebal.rf.gd/baal_veer_episode_101.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/best_offline_shooting_games_for_android_2019.pdfIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_492b21d1c3ad465abe85070fee6800aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9efea1e3-c11c-44ad-8690-924c5ded5f86/kenmore_wall_oven_parts_canada.pdfIn PDF document text
    • https://dd3a609d-fcd9-461e-ae06-f7e9ec6f332d.filesusr.com/ugd/811c3f_241cebba170048cf8c49cd9eebff73a7.pdf?index=trueIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_a02cd09a79a640e58ab4d8731bdfaf47.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voxulija/bengali_dj_song_._in_mixclub._in.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f960c2-87d5-4b44-b972-59e2cccbd29e/cuantos_centimetros_tiene_un_medio_metro.pdfIn PDF document text
    • http://bijivarewexobu.rf.gd/42682732675.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/one_piece_brook_song_violin_sheet.pdfIn PDF document text
    • http://kuporalegumema.epizy.com/13534114460.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/xopeviregubifibirati.pdfIn PDF document text
    • http://rovututuxopi.epizy.com/83433615185.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/99789113125.pdfIn PDF document text
    • http://zujexig.epizy.com/lockpicking_leveling_guide_classic_alliance.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/wusokijamoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b6ccd5a-fe71-45d5-aeb4-7e92f467e688/what_is_the_purpose_of_a_quitclaim_deed.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_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 5280 bytes
SHA-256: ef0cb807c17bd14efd49c31f3b8ef2e755f82b0d6221fbc1cebc585ce41d53c8
font_01_sfnt_off000107c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 11284 bytes
SHA-256: 7238e610e0842efe10235ca21a04b8461da34a1d0bb84accaf0f6a0dbc7b29ff

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