Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cfc26638698c4d…

MALICIOUS

PDF

72.5 KB Created: 2021-04-17 14:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 895c497f4bfe64eef47bf29372b9d5d7 SHA-1: ffc679c87693d9cf383e3030d39a4a0413890c1f SHA-256: f1cfc26638698c4dc36a123e297a104ce62550d9ae2912f6dab7bb29d956a6a4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent link disguised as a search query for 'how much does a plumber charge to replace a faucet cartridge'. This link, https://soxebez.ru/strik?utm_term=how+much+does+a+plumber+charge+to+replace+a+faucet+cartridge, likely leads to a phishing or malware distribution site. The PDF structure and embedded links suggest an attempt to trick users into visiting a malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=how+much+does+a+plumber+charge+to+replace+a+faucet+cartridge PDF link annotation
    • http://muvepifare.mygamesonline.org/oxford_english_to_bengali_dictionary_download.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/jajotegajavalumig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501208/normal_60496d784bf15.pdfIn PDF document text
    • http://reveruverof.medianewsonline.com/74346788591.pdfIn PDF document text
    • http://maxobujixeweden.sportsontheweb.net/ge_hydrowave_wont_spin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426558/normal_602ba914ac000.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/how_many_books_of_fifty_shades_of_grey_are_there.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_600ff9100fed1.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/grammar_exercises_for_class_10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479718/normal_604e8e90ae550.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/grade_2_math_assessment.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384028/normal_5fe872c77891e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7e39ba7-4e64-429c-8440-300cc67aa55d/what_genre_is_the_rangers_apprentice_series.pdfIn PDF document text
    • http://bosagiriwamokin.onlinewebshop.net/925936199.pdfIn PDF document text
    • http://jufogitomob.onlinewebshop.net/31803592304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40061ce5-0484-4ab2-b9eb-3862ff6dcccd/pusos.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/92223193814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/582f72f9-87e2-40a1-abcd-aa4c56748540/46421323635.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_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 5760 bytes
SHA-256: fdf51bf96a2fca28a9b96ccfb70a3397a388810fe42f7da143cf0b68681932e3
font_01_sfnt_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 10008 bytes
SHA-256: 534648fb4dd2f960c2374b3cbce6eb33dd81a973a2f7ec47b761cdd5780cb67d

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