Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8eeadcd34926ac1…

MALICIOUS

PDF

85.7 KB Created: 2021-03-16 03:07:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e6ad3de9d0e17c7d10ebe442adb9520c SHA-1: 2dff0d575b76d3fbd6985443ecb7857b7baf10f3 SHA-256: a8eeadcd34926ac14348dd7de68b62031baa623e527f999e909cbdd65fff208c
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, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'authorization letter sample to process documents'. The presence of external URIs indicates an attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dugedepap.ru/wix?keyword=authorization+letter+sample+to+process+documents+in+pag+ibig PDF link annotation
    • http://choosemadam.site/ghost_boy_lil_peep_lyricsmz8ki.pdfIn PDF document text
    • http://secret-empire.ru/42359777848pj8zi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454420/normal_603926ce995ba.pdfIn PDF document text
    • http://xebiniseba.mygamesonline.org/cyanide_and_happiness_card_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446915/normal_60489797a7e07.pdfIn PDF document text
    • http://usesol.xyz/anker_bluetooth_keyboard_a7726_manualcqhgb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_60473acd6136e.pdfIn PDF document text
    • http://itravelgr.com/stray_cat_doors_2_mod_apktbf8o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481515/normal_60240d1d08329.pdfIn PDF document text
    • http://healthytrands.com/huck_finn_quotes_about_friendship_with_jimnn2y7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409093/normal_6008b7c104cc3.pdfIn PDF document text
    • http://opensol.xyz/21038679782e2v3r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474470/normal_6036201633787.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5feb6db5b09ef.pdfIn PDF document text
    • http://markettop.pro/how_do_you_strengthen_your_intuitionf03oj.pdfIn PDF document text
    • http://storedubai.shop/how_to_measure_home_energy_efficiencyuu2x9.pdfIn PDF document text
    • http://zoom-omsk.ru/19705891514l3oaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_6015e57fe9bf0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_45e20246466e4e088eff35da382ab51d.pdf?index=trueIn PDF document text
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_f319203eb46d48a5b8e81ca95868c0cc.pdf?index=trueIn PDF document text
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_c7d10e0e8cdb43f3a3d74f180f7b2cd7.pdf?index=trueIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_d0e33fdd611f4875bdefb293be3879e9.pdf?index=trueIn PDF document text
    • http://xawiwevivuzox.onlinewebshop.net/beatles_get_back_guitar_tab.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DD 2828 bytes
SHA-256: a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
font_01_sfnt_off000112d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D7 5668 bytes
SHA-256: b9c061f3671b4bccc4bd3465cfcbf060fed2750da36f258eb3176c9393326cf1
font_02_sfnt_off000125eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 10128 bytes
SHA-256: c64998ca1916ce07bfdf033fb4b25ba4b92e2b38d407a13cfaf7a938e136b8e5

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