Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb85e7780220b32…

MALICIOUS

PDF

76.9 KB Created: 2021-03-18 22:28:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bd78a6dd08c1c38ce6247d66c9e4c3d SHA-1: 73cececf83e4e9f1e5a93bb92eb1999fe3b868eb SHA-256: 2cb85e7780220b32e54899514ee529690f66412ed04718661e1d21a4f358f716
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to SEO spam domains. The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a link farm, suggesting a phishing or malicious content distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/award?keyword=first+and+second+conditional+speaking+exercises+pdf
    • https://cdn.sqhk.co/satofurijob/e0Wvhbd/mabujoxawexubid.pdf
    • https://zitudoxe.weebly.com/uploads/1/3/1/4/131437236/siteparorugux_vujidate.pdf
    • https://cdn.sqhk.co/reromiwo/dAVOhcv/fizivagoxadorod.pdf
    • http://xulazawelinuze.scienceontheweb.net/cell_phone_addiction_test.pdf
    • https://cdn.sqhk.co/fikalibumi/eps8hhG/salexosak.pdf
    • https://cdn.sqhk.co/pajijolabalu/hnI0VRw/98509402970.pdf
    • https://cdn.sqhk.co/xivovido/S0hdibF/liwutorudesonabisunu.pdf
    • https://kapexuzavum.weebly.com/uploads/1/3/4/6/134691047/xefisojo-jogedusosulo-walufokaritefo-ditasapima.pdf
    • http://xagugudel.sportsontheweb.net/how_to_play_2_player_on_goat_simulator_ps4.pdf
    • http://zekojotewakugag.mypressonline.com/ryobi_leaf_blower_carb_kit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wujagenak.atwebpages.com/amsterdam_travel_map.pdf
    • https://s3.amazonaws.com/lorifumofelu/vunofidapozivos.pdf
    • https://s3.amazonaws.com/zozuxukoxo/bioresorbable_collagen_membranes_for_guided_bone_regeneration.pdf
    • https://s3.amazonaws.com/wibedubosateg/nuxibofokobisujoxano.pdf
    • https://s3.amazonaws.com/ninazarila/fusionner_en_un_seul.pdf
    • https://s3.amazonaws.com/loranoduzuja/bhagavad_gita_chapter_2_chinmaya_mission_lyrics.pdf
    • http://saluwagasa.onlinewebshop.net/gorenipasuzime.pdf
    • https://s3.amazonaws.com/wulagisi/armored_core_ps3.pdf
    • https://s3.amazonaws.com/zufaxepixiguxax/panasonic_pbx_telephone_system_contact_number.pdf
    • https://s3.amazonaws.com/lunojol/40159866220.pdf
    • https://s3.amazonaws.com/mosezavor/71565764292.pdf
    • https://s3.amazonaws.com/dikobepibelun/59898400793.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_off0000e7ba.bin
c092ca3b59680274890cebe7045ffed6ed8bad3786fc054bc4f05892fe60b1fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BA 5408 bytes
font_01_sfnt_off0000fa3e.bin
bbc01467d9f96282fbd00ccf1d4c14b2c81c72e6b6529247ad711ff38e0c3f57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 13960 bytes

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