Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab8ef8f056cc9d6…

MALICIOUS

PDF

84.0 KB Created: 2021-02-24 22:59:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a956e803c36b50157d1d37cab8763074 SHA-1: d2656666c1c61b3b100a921e21b7cabbcbd70e84 SHA-256: 9ab8ef8f056cc9d640c3838cbcdbf333c1aaf4119fe97ed89975549c9791670b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to obscure malicious destinations. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, likely for phishing or distributing further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=caminar+sobre+el+agua+significado
    • http://tojumuwuluso.iblogger.org/caballo_de_troya_1_jerusaln_1984.pdf
    • http://dorulezebum.sportsontheweb.net/basics_of_biblical_hebrew_vocabulary_cards.pdf
    • https://putukaxuke.weebly.com/uploads/1/3/1/4/131437363/088927b.pdf
    • https://cdn.sqhk.co/poladejug/mgejaic/15173846125.pdf
    • https://cdn.sqhk.co/sidamebo/kAnif1A/zusogulapevusojobimujow.pdf
    • https://cdn.sqhk.co/tivinarafuvu/DHYgdgh/49040699027.pdf
    • https://ruvezidarumova.weebly.com/uploads/1/3/1/3/131380493/jewuvix_kuradadokitamox_xuxepekilo.pdf
    • https://cdn.sqhk.co/jibenapola/JidPFhW/tumblr_quotes_funny.pdf
    • https://zubikazosiz.weebly.com/uploads/1/3/4/7/134761183/saleg.pdf
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/texiziz.pdf
    • https://cdn.sqhk.co/dolafita/dBgifhd/jumusobudanomumabag.pdf
    • http://fusubakitakudup.66ghz.com/45678299751.pdf
    • http://mapotilij.mygamesonline.org/the_trials_of_apollo_1_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://jinizegujez.rf.gd/ranotore.pdf
    • http://tufuripisaren.epizy.com/laperinivolefewu.pdf
    • http://titetirif.epizy.com/brand_authorization_letter_format_in_word.pdf
    • http://zubiluwetij.myartsonline.com/88098577182.pdf
    • http://xunevonobi.epizy.com/visekekuvufalomujiketi.pdf
    • http://nekipusixewid.epizy.com/amma_songs_kannada.pdf
    • https://s3.amazonaws.com/pugomonapoxuxe/alaipayuthey_bgm_kuttyweb.pdf
    • https://s3.amazonaws.com/vuxagixil/92436637877.pdf
    • https://s3.amazonaws.com/kotenu/julomafujijak.pdf
    • http://didodijore.rf.gd/42719394612.pdf
    • http://nukilaba.myartsonline.com/sitalikadorob.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_off0000fab4.bin
203e4cafcf1326351f06d1e903fc4535e1217c199c45a42621bdd75a79caacf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 5308 bytes
font_01_sfnt_off00010c9e.bin
5acfcd21122b3cdc50997ac1f153c91249d897916eb9724075750dd66907771a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9E 11580 bytes
font_02_sfnt_off00013235.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13235 4324 bytes

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