Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92d12ae7f7417dd…

MALICIOUS

PDF

70.6 KB Created: 2021-03-25 12:43:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8666f26cd30a42ed679bb4d37508e5ab SHA-1: bf4e031b5efa0a0bc360ca90b21bfa75025c4090 SHA-256: f92d12ae7f7417dd1924c79d703e5d5b704361bb119f45ebc681105164f5093c
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many of which point to disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The presence of 'utm_term' parameters suggests tracking or redirection, further supporting a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/123?utm_term=hungry+shark+evolution+android+oyun+club+hile
    • http://xasanefajisa.sportsontheweb.net/amparo_dvila_cuentos.pdf
    • http://ijmalan.xyz/tera_crafting_guide_2019slw2w.pdf
    • http://bluhgang.best/browning_hi_power_clonesay4gs.pdf
    • https://loropigofog.weebly.com/uploads/1/3/4/5/134595907/63ce6682ac0b.pdf
    • http://italy50wow.pro/dunitulomekabimuq4iz.pdf
    • http://aycotoro5.xyz/dvoretskys_endgame_manual_drive13260.pdf
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/8124361.pdf
    • http://jinevul.mygamesonline.org/download_software_to_word_untuk_pc.pdf
    • http://xogunajeraxuda.mywebcommunity.org/edit_files_online_free.pdf
    • http://job-finder.space/gadanidesoduzozagel8blss.pdf
    • http://tanijijud.sportsontheweb.net/fisiopatologia_del_accidente_cerebrovascular.pdf
    • https://dipedupaketi.weebly.com/uploads/1/3/4/3/134333799/18d13f00.pdf
    • http://9gusevshop.website/vilter_compressor_manualg9kxc.pdf
    • http://fionainthefield.org/rojozirsmql2.pdf
    • http://mubarominufu.iblogger.org/diwetowulax.pdf
    • http://playmarket-online.com/74233339521dgas1.pdf
    • http://jokidinavefo.22web.org/biochemical_test_book.pdf
    • http://choosenews.space/xovamanososaworijaom5ik.pdf
    • http://mamontov-net.cc/mozasujexegudanaj8m5xa.pdf
    • http://cartest.pro/watch_pulling_strings_free_onlinermk5x.pdf
    • http://gojevomarokabe.getenjoyment.net/clasificacion_de_animales_vertebrados_e_invertebrados.pdf
    • https://mumifigade.weebly.com/uploads/1/3/4/3/134314269/598139.pdf
    • http://rmk4sale.xyz/how_to_repair_a_leaking_water_softenerz4r25.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d16a.bin
7ad2f37fa2a2e394af7603e28d819bb9502d31a91be2399f58384c7771e626cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 5528 bytes
font_01_sfnt_off0000e439.bin
04f8c91fe2f176ecbb8ab32a17f3d4f5ff2fdb18227fbdf73b444c43811cac2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE439 12560 bytes

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