Malicious PDF — malware analysis report

Static analysis result for SHA-256 59669261ff656c83…

MALICIOUS

PDF

76.3 KB Created: 2021-03-22 13:32:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ba98f46f3dc1207c9d40bda2a85f5d48 SHA-1: 6f345abf15cc9576e33b94444af37a1fb8026f28 SHA-256: 59669261ff656c83763b28d13bcaddaf40f623930e874a606ed26e2b16d9b9a4
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, and one specifically uses a UTM parameter suggesting a tracking or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links, likely for phishing or malware distribution.

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://jumiwimov.ru/strik?utm_term=sat+books+to+read PDF link annotation
    • http://mupifojoxur.medianewsonline.com/effective_public_relations_cutlip.pdfIn PDF document text
    • http://nozumupi.medianewsonline.com/38317770848.pdfIn PDF document text
    • http://ruvenebigolusep.mywebcommunity.org/old_school_rap_radio_station_dallas.pdfIn PDF document text
    • http://tapagigozi.medianewsonline.com/bimebukexobexunuw.pdfIn PDF document text
    • http://bopugafuwu.scienceontheweb.net/bobosonusaruwusiponape.pdfIn PDF document text
    • http://ductsunlimitedins.com/surezevolr4uq.pdfIn PDF document text
    • http://digitalmedialit.com/google_play_games_free_pc74bdi.pdfIn PDF document text
    • http://optamorem.com/93357354597zc7x0.pdfIn PDF document text
    • http://trysol.xyz/kicker_pt250_10_subwoofer_with_built-in_100w_amplifier_reviewt2l6m.pdfIn PDF document text
    • http://goodshopsales.xyz/happy_wheels_unblocked_cool_mathruee3.pdfIn PDF document text
    • http://kewotij.mypressonline.com/90597159962.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/rain_dial_irritrol_rd-600_manual.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/53374259617.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/can_you_remarry_after_divorce_scripture.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muvekalufisu.atwebpages.com/niluroside.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_f82d40ed062d4a2ab8476381647d65e9.pdf?index=trueIn PDF document text
    • http://womidelere.myartsonline.com/fasilazixitusuwidufox.pdfIn PDF document text
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_812302ff51cb47f19716c4afdc87ad1b.pdf?index=trueIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_43ebf15d95124ee3a4c52a54087226f9.pdf?index=trueIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_0aed04f81162496d820fcd19e524a0b3.pdf?index=trueIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/37365560134.pdfIn PDF document text
    • http://pizitibasowu.atwebpages.com/chinese_characters_stroke_order.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/wizards_of_the_coast_entry_level_jobs.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 5096 bytes
SHA-256: 4668d7f1e041b50d7e3dc30bd4b2d23af7ad75fd6beaeb4b0455a81c8ccbbd73
font_01_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 10536 bytes
SHA-256: 8fc3eaf8ef0c499206368a312c7835feb93192dd7b5a83b277e4f99215cb327d

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