Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f4401a03107461…

MALICIOUS

PDF

85.8 KB Created: 2021-05-11 22:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f5ed5d057f6ce2f3dae0d255c493b60e SHA-1: 3900f9dff6c95d4fbe1be47b9daed5306d129ba5 SHA-256: 03f4401a031074619077a019a9ccc0d35587e9688447c977a9de3053daf25687
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('botokaw.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a malicious intent to use disposable hosting for link farms. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest the document is designed to redirect users to malicious content.

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://botokaw.ru/strik?utm_term=kenmore+795+refrigerator+test+mode PDF link annotation
    • https://lelameju.weebly.com/uploads/1/3/4/0/134040913/taworuzatetu.pdfIn PDF document text
    • https://nidikibadut.weebly.com/uploads/1/3/1/4/131453007/lapigexaduxujoz_nagapumu_mepejerexete_titajalowu.pdfIn PDF document text
    • http://fuziral.iblogger.org/talking_tom_hero_dash_android_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474218/normal_6060090566d4d.pdfIn PDF document text
    • https://xufolonul.weebly.com/uploads/1/3/2/6/132695880/5904056.pdfIn PDF document text
    • http://sibasijiv.22web.org/application_letter_format_for_primary_school_teacher.pdfIn PDF document text
    • https://delidenaluno.weebly.com/uploads/1/3/4/4/134438050/ed3b324c7fa6.pdfIn PDF document text
    • https://fubupudixad.weebly.com/uploads/1/3/4/7/134742266/tovebitagovuraf_gesukuxuw_pinudenugasik.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/72338217126.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408584/normal_5feb87c1dfa9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388428/normal_5fec91b037385.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/45485973405.pdfIn PDF document text
    • http://nivewuwasidurus.epizy.com/number_theory_book_by_ivan_niven.pdfIn PDF document text
    • http://mapexas.epizy.com/author_s_purpose_worksheet_2nd_grade.pdfIn PDF document text
    • http://minivenema.atwebpages.com/60727940813.pdfIn PDF document text
    • http://bolilolu.epizy.com/76432715713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f48a35c8-18d8-4f81-9779-4461fc478257/jexozogelibosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e46b5e-cae8-44e2-b34e-f4dbe07499eb/big_buddy_propane_heater_batteries.pdfIn PDF document text
    • http://linewezidewixa.rf.gd/basic_arabic_words_to_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4401f454-612c-4eb0-9432-15bab2468190/wipamuxola.pdfIn PDF document text
    • http://lopakesuzuw.atwebpages.com/calculus_textbook_larson.pdfIn PDF document text
    • http://vukenorap.epizy.com/jebuvatugefibezofofem.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/how_many_months_is_nigeria_navy_training.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_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 5524 bytes
SHA-256: 1dd0e5c56cb178675098b57e44512cfd80d33693f25edb3044249031d12ead50
font_01_sfnt_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 13264 bytes
SHA-256: d4ba778509c7decd52066e667f247e577f96f46d3dd35ea97030c14dbbc5a31a
font_02_sfnt_off0001345e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345E 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15