Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3312b11cf106ef…

MALICIOUS

PDF

90.8 KB Created: 2021-04-29 14:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4bfcde093d9d0f289c80400332fc1dda SHA-1: 6d0625d857dc92660b797a624df107f9807af672 SHA-256: 8c3312b11cf106effd0f8345ccd589acb2591f6071f67bfb714263f8c69e4f23
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm or phishing lure. The document body is heavily obfuscated, but the presence of URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the primary goal is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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 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.
  • 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://bologen.ru/strik?utm_term=jbl+cinema+sb400+setup PDF link annotation
    • https://cdn.sqhk.co/wovudojemu/ijKhhVw/my_talking_angela_download_apk_free.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://proba7.xyz/piano_play_magic_tiles_games_appleqf3a6.pdfIn PDF document text
    • http://shtampshop.ru/33973986920a1p36.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/ligjggE/bobufosisiwure.pdfIn PDF document text
    • http://claire-irk.ru/fofaxojuxifl6c6o.pdfIn PDF document text
    • https://cdn.sqhk.co/gimanoretev/jys9dhe/funny_horror_game_youtubers.pdfIn PDF document text
    • https://cdn.sqhk.co/zijopenuxafi/K6Vangd/iptv_gratuit_pour_android_tv.pdfIn PDF document text
    • http://covid-19online.site/infanteria_alemana_en_la_segunda_guerra_mundialo63bx.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/ePqmkha/11885218093.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/dicneji/jipofebuxax.pdfIn PDF document text
    • https://cdn.sqhk.co/nalujujoso/xhdseja/ragoluso.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/does_arthritis_come_from_cold_weather.pdfIn PDF document text
    • http://sewukagazub.mypressonline.com/devavatidarizitaw.pdfIn PDF document text
    • https://cdn.sqhk.co/fifunolew/ggrgj7Y/2020_ford_mustang_super_snake_hp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_1b669e6425724ce6b6d60a907e1d4b79.pdf?index=trueIn PDF document text
    • http://xolevusafo.myartsonline.com/grade_3_ac_joint_separation_icd_10.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_7cdbb7569154408d9532f482449a67d3.pdf?index=trueIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_138a00a226944172abd2d202b94bfae5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezutu/crackstation_s_password_cracking_dictionary_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/kibanefasokudajuribiz.pdfIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_e9a2ef1384b84ee7b668aefcd1340f6c.pdf?index=trueIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_ba0ad9580ff145f98354d31e6386ccc9.pdf?index=trueIn PDF document text
    • http://furunes.onlinewebshop.net/42130145302.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/sql_server_2016_developer_edition_exe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA6 5340 bytes
SHA-256: a74ef38a49619f9a0e97d068df979a9293ad95a6f08b35cd5cfa95cdd22da196
font_01_sfnt_off000121c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C0 11336 bytes
SHA-256: 6486720e4726922509700fe0da185aaca1155ed7a777c9e419f568029d7b410c
font_02_sfnt_off00014876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14876 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8

Open this report in the interactive analyzer, or submit your own file for analysis.