Malicious PDF — malware analysis report

Static analysis result for SHA-256 641d22f0fa8a0d48…

MALICIOUS

PDF

169.0 KB Created: 2021-04-02 20:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9bc934a0b482188c80d82d67a2e7a366 SHA-1: b03626c61670d60d1030a635b477bcbe1798b71a SHA-256: 641d22f0fa8a0d48c706356eee54e8ab741e2f60295fda46b343ebc576c2737a
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though partially corrupted, suggests a lure related to downloading content, which aligns with the external URIs pointing to download-related paths. The presence of numerous disposable domains and link farms further indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/strik?utm_term=les+miserables+album+download+zip PDF link annotation
    • http://alcozerox.com/35121773345gmb3m.pdfIn PDF document text
    • http://copyrightsupport-ig.com/titulos_de_credito_impropios_ejemplosqg6pd.pdfIn PDF document text
    • http://itanto.space/face_changer_for_pc_free_downloadtbtp9.pdfIn PDF document text
    • http://how2clever.com/dugonomuntukgu.pdfIn PDF document text
    • http://hisgohar.site/ateten_gmlek_roman_tahlilin4nvo.pdfIn PDF document text
    • http://reetodo.online/rukivosexaduvucxjzn.pdfIn PDF document text
    • http://whitetwo.space/rerududojamidiwituromazuyf1yd.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/betamethasone_topical_davis.pdfIn PDF document text
    • http://myshoes.moscow/98858571965zk6i3.pdfIn PDF document text
    • http://rifijetuvijilam.medianewsonline.com/27451781015.pdfIn PDF document text
    • http://byt-upak.ru/what_is_salvage_in_maritime_lawpj3kv.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/befefipurodemem.pdfIn PDF document text
    • http://myluckybet.xyz/howl_poem_allen_ginsberg_analysiskec4q.pdfIn PDF document text
    • http://aycotoro5.xyz/mini_dv_tape_camcorder_to_buypwch8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_021c5bbbf6324172be4250e5de069659.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d43e0370-24b7-4874-9e6d-bcd944664501/brother_hl_2270dw_series_printer_offline.pdfIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_755bf0e31d344f2d9294b373b8bd5061.pdf?index=trueIn PDF document text
    • http://kozogasivufi.myartsonline.com/principles_of_chemistry_a_molecular_approach_4th_edition_free.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_9ec445579a4543b5a9f927df91d2ba72.pdf?index=trueIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_422e2abe874f487ebd91118f789a87fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea6f59ef-f995-4c6e-97eb-02ea7f1a540d/banewusinivu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000235f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x235F6 3076 bytes
SHA-256: fecf651c51d7609efdfadc6728fa5bd88d5e51933c362deda731b562da89a194
font_01_sfnt_off000240f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x240F1 5328 bytes
SHA-256: 9f81bc777c0ac0910d5962fc59d2364baee08a34e795d1dd51b54dc6761e9244
font_02_sfnt_off00025308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25308 13844 bytes
SHA-256: a804a011685e6ec596b5210330b9c955ee492e3c8cd3d198de33e6602717b4ea
font_03_sfnt_off00027fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27FD8 16296 bytes
SHA-256: 13ade2a094d91a594c351fb2a94cd9a7a5d9fd8ec28225a9cf4716043632e345