Malicious PDF — malware analysis report

Static analysis result for SHA-256 1972063471bcef79…

MALICIOUS

PDF

81.5 KB Created: 2021-03-28 10:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 189c7c160495d6adc57b812bab5d64b9 SHA-1: 299f834784a0abf78641f6861238ee40dc84fdd2 SHA-256: 1972063471bcef7940f4c8b053859eba914e23ede0f2d5e88974af0d3ed99475
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=south+carolina+miss+america+speech+transcript
    • http://trendmobile.ru/how_to_make_money_on_onlyfanscjgmp.pdf
    • https://gapibuxox.weebly.com/uploads/1/3/2/6/132695643/pefomusiw_liribokirilo.pdf
    • https://cdn-cms.f-static.net/uploads/4411489/normal_603b5d071f072.pdf
    • http://wozekozexufoxol.scienceontheweb.net/abnormal_uterine_bleeding_nice_guidelines.pdf
    • http://consumer-data-protection-bureau.com/33534370305tehsq.pdf
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/wekeloxiz.pdf
    • http://smartcoin.design/the_game_of_life_board_game_onlinevzfmw.pdf
    • https://jujamepusa.weebly.com/uploads/1/3/2/8/132815903/nufoxaluromisurolig.pdf
    • https://cdn-cms.f-static.net/uploads/4491965/normal_6041f0e67df6a.pdf
    • http://lg-copyrightforms.com/larabibikegumor44vz1.pdf
    • http://bullbananavannaone.xyz/contract_lawyer_chicagoy4woh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/sojenozap/bafg_formblatt_3_ausfllen.pdf
    • https://s3.amazonaws.com/taguxif/bafang_bbs02_250w.pdf
    • https://s3.amazonaws.com/gateme/sezepuvo.pdf
    • https://s3.amazonaws.com/radubozufiwo/how_to_install_tantan_smart_plug.pdf
    • http://jifimurosesapu.atwebpages.com/jackie_wang_carceral_capitalism.pdf
    • https://s3.amazonaws.com/viromibukoleliw/all_html5_tags_must_have_mcq.pdf
    • https://s3.amazonaws.com/rujimidujek/how_to_program_chamberlain_clicker_garage_door_opener.pdf
    • http://zuputes.atwebpages.com/med_el_sonnet_2_audiolink.pdf
    • http://timerojulawu.myartsonline.com/the_standards_real_book_eb_version_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f330.bin
4207f3e36c6f2ba6a6a7c56be2c324eee0dde45aee62a8c33f0d07ddf77e2505		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 5156 bytes
font_01_sfnt_off0001047e.bin
7baeb1a2267bbdb9be809c011bfc35b35ba6a3ae6022f0539fcbc8b24e3b7178		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1047E 11172 bytes
font_02_sfnt_off00012a24.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A24 4324 bytes

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