Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc67f9594482e2c…

MALICIOUS

PDF

96.0 KB Created: 2021-06-10 07:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: afd4fbddfa51b4781b450ec98e853376 SHA-1: d8d491e82865a3b7ea8efa997a17a2d03bf986c0 SHA-256: 1fc67f9594482e2c7bf2e7e6cd8228c552a71ceb04c315a2efbd94e67abea327
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs pointing to disposable domains, with one prominent URL related to 'among us cheat android'. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, and ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION confirm its malicious nature. The document body, though heavily obfuscated, contains keywords suggesting a lure for cheats or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://synerhu.ru/pbw?utm_term=among+us+cheat+android+always+impostor PDF link annotation
    • https://guzifako.weebly.com/uploads/1/3/4/0/134096492/1e0b2b6ed6b1.pdfIn PDF document text
    • https://jobeluraxofedir.weebly.com/uploads/1/3/4/3/134317239/bibitunefuxejev.pdfIn PDF document text
    • https://fawofasoz.weebly.com/uploads/1/3/1/4/131454040/kajusepa_nofevavokapesu_katokoragonan_linogaziwuroz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liralafum.pbworks.com/w/file/fetch/145001553/gulp_mary_roach.pdfIn PDF document text
    • http://fipivuzigoge.pbworks.com/w/file/fetch/144562074/electric_motors_and_control_systems_petruzella.pdfIn PDF document text
    • http://zezupagijene.pbworks.com/f/observation_and_inference_activity_middle_school.pdfIn PDF document text
    • http://garigor.pbworks.com/f/nescafe_dolce_gusto_descaler_nz.pdfIn PDF document text
    • http://tozuxexap.pbworks.com/f/82697696688.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/w/file/fetch/144825831/41674792170.pdfIn PDF document text
    • http://lonazetubuz.pbworks.com/w/file/fetch/144552441/how_to_pass_motorcycle_permit_test_in_ohio.pdfIn PDF document text
    • http://tojasakamu.pbworks.com/w/file/fetch/144615348/84107565000.pdfIn PDF document text
    • http://lururefisu.pbworks.com/w/file/fetch/144560514/what_is_the_main_idea_of_the_lottery_by_shirley_jackson.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144418476/what_does_ch_mean_on_lg_air_conditioner.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/uncg_exam_schedule_spring_2020.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/f/jukarujagopuderiworikor.pdfIn PDF document text
    • http://betifabito.pbworks.com/f/vomafumawinisipe.pdfIn PDF document text
    • http://puzavofan.pbworks.com/w/file/fetch/144816489/nigovujuloxawalowoka.pdfIn PDF document text
    • http://pexovobef.pbworks.com/w/file/fetch/144778185/candy_crush_saga_mod_apk_for_windows_10.pdfIn PDF document text
    • http://vezawegafu.pbworks.com/w/file/fetch/144798009/skyrim_where_is_solitude_jail.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/f/yayn_denizi_10.snf_fizik_soru_bankas_zmleri.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_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 3700 bytes
SHA-256: 063c9b9914d2bac8c1bb1b453eaf070ac60da51a559b45788e17605e321a8e18
font_01_sfnt_off0001161a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161A 5672 bytes
SHA-256: ff8632185e3201601a387315609bb06d00fcce0e4026080ed33c323c3a894b26
font_02_sfnt_off00012952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12952 18712 bytes
SHA-256: fd37f1ab6bb4be4356b43a046da5966f6a659081edc3232a6b96b4bcd4db60f3
font_03_sfnt_off00015bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD1 16060 bytes
SHA-256: 2d97eb5b8c66583654a55461b75ebc9d5954fe3bb26bfbf5761d5bfdae6bb250