Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afbaa2695a94dbd…

MALICIOUS

PDF

80.8 KB Created: 2021-05-14 00:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a91dd2017c9ad76096d7e37c5ae3c824 SHA-1: b29b1d73a59363a47b8658ea85e8542b142b6d0e SHA-256: 7afbaa2695a94dbdce3fba1694a37ecf218aaa35d39bd41babd3e34d1afe3bae
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable domains and acting as a link farm. One specific URL, https://xezojetit.ru/strik?utm_term=is+kaneki+in+love+with+hide, is flagged as a high-risk indicator. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=is+kaneki+in+love+with+hide PDF link annotation
    • http://aromaita.space/skyrim_orc_civil_war0ocyn.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/hcbSged/sudoku_hard_puzzles.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/bdhigiT/42358391746.pdfIn PDF document text
    • http://poradoit2.site/how_to_use_the_schumacher_battery_chargerwhk3q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/do_any_ivy_leagues_offer_online_mba.pdfIn PDF document text
    • http://zarazemudaseri.epizy.com/devijoma.pdfIn PDF document text
    • http://zelovavatag.rf.gd/japarovi.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/vixonajapunonowagix.pdfIn PDF document text
    • http://buketoxepebaf.epizy.com/human_body_systems_test_7th_grade.pdfIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_7bcfcf1bd8fc439e99569e116dde9efd.pdf?index=trueIn PDF document text
    • http://faxesago.rf.gd/wearever_pressure_cooker_seal.pdfIn PDF document text
    • http://jikelofov.rf.gd/xotodikeletogovajod.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/ketogenic_diet_recipe_book.pdfIn PDF document text
    • http://pugobisijutefe.epizy.com/captivate_us_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/soundcloud_apk_2015.pdfIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_c65988fb984c40e0b7421bd4596d5313.pdf?index=trueIn PDF document text
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_d9e0c3c549664b8a95fd985a4879aaaf.pdf?index=trueIn PDF document text
    • http://fokodema.epizy.com/9256557032.pdfIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_f0a675a97d1747c3ba99e26d43a5eb25.pdf?index=trueIn PDF document text
    • http://kaxogesidod.epizy.com/backpacks_mod_1._8.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_off0000ec25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 4972 bytes
SHA-256: 438b893980cb0e73687938b2f073683fd406289d1ac9c4801eb0e9e76d81d914
font_01_sfnt_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 10312 bytes
SHA-256: b742cbd98e1ee1886d7e547949700eb3038aeb115cb3bb5fea808c71cdc23de4
font_02_sfnt_off000120b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B5 16100 bytes
SHA-256: 26b31ba2131ae2f7da025a7fda5e9dcfe79fc1d25f6641dd8c13613e564b4b69

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