Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb766a096f1c554…

MALICIOUS

PDF

79.4 KB Created: 2021-03-28 08:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6d12cb6e6d646c01a4bacfec3d33bc08 SHA-1: 0a343980fbe012acf0fef6d8c091dde47195ee68 SHA-256: 5cb766a096f1c55454384b4163451bbfba06e8afe4716e604b2ab1e4e48cc084
214 Risk Score

Malware Insights

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

This PDF was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to lure users to potentially harmful websites, likely for phishing or malware distribution, disguised as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/award?keyword=ammonia+refrigeration+system+pdf In PDF document text
    • https://cdn.sqhk.co/dipewoduge/fiibgdy/40677925442.pdfIn PDF document text
    • https://xijaxerunoseme.weebly.com/uploads/1/3/4/3/134306079/kixejal_buliledawoji_pematetizanudo.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/iakgeB6/alan_walker_faded_piano_sheet_music_free.pdfIn PDF document text
    • http://teplotronic.ru/sosovab4h7m8.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/lutemerofisodamixekalvb9or.pdfIn PDF document text
    • https://fenitejum.weebly.com/uploads/1/3/2/3/132302819/ruragulana-fusabipojed-pexosilitirexe.pdfIn PDF document text
    • http://electrumwallet.buzz/33979488403filum.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/hgie80t/can_you_break_dungeon_walls_terraria.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/h8he1ii/24559329264.pdfIn PDF document text
    • https://divamokavagi.weebly.com/uploads/1/3/4/8/134871471/36a696.pdfIn PDF document text
    • https://cdn.sqhk.co/garisuvonuk/htgdohy/screenshot_recorder_online.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/fekaduvopigab/jefara.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_c43f6da6602743119f9f0b12a96edc1e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/42583558079.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/how_to_calculate_angle_measures_in_parallel_lines_cut_by_a_transversal.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/tipos_de_comunicacion_humana_hombre-maquina.pdfIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_4b16a331c20b434f9de1294b1198560b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/49787099258.pdfIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_2d2bd0297667441299fca7bf7763ccfa.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_bded8c6ce34749458f1791ccd1e4969d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/john_deere_gator_cx_parts_list.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_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 5420 bytes
SHA-256: 9ade7ac023f7e674a7410d6bf8cde851d05a16b590fc545e62a1779d707a78ec
font_01_sfnt_off00010a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 10588 bytes
SHA-256: 3617c1e65bc94ea6063f596b3673d20b445d6d0556bbabe8685bbe37fa9992d1

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