Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b82d2bc79f79813…

MALICIOUS

PDF

79.6 KB Created: 2021-05-18 11:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 392e3efe8e7446e48d7a17129fab11b3 SHA-1: ca03435228364201120f7e687f9b55f013572a20 SHA-256: 1b82d2bc79f798135d6378d0c2ab582e898e85e6968123e8bdf7561557eb4378
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is classified as malicious by ML models and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, directing users to numerous external websites, with a primary lure related to English grammar worksheets. The presence of multiple disposable hosting domains and UTM parameters suggests an attempt to obscure the ultimate destination and potentially engage in phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/strik?utm_term=ser+estar+tener+worksheet+pdf PDF link annotation
    • http://kulofokugizadeb.22web.org/sahih_bukhari_bangla_darussalam.pdfIn PDF document text
    • https://miwimuwal.weebly.com/uploads/1/3/0/7/130775744/5658099.pdfIn PDF document text
    • https://pojebozotez.weebly.com/uploads/1/3/2/6/132695867/letopiwiw-xolijoxuxajawuj-defosafox-kurewibu.pdfIn PDF document text
    • https://kitikifotise.weebly.com/uploads/1/3/5/3/135321604/2588e.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/1ffaef60-4f0f-4b72-a26a-81c260e36880/43552069305.pdfIn PDF document text
    • http://retelikejajego.rf.gd/present_simple_and_present_continuous_exercises_cambridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b7f38bf-56ee-4959-9c35-232c62848e95/rigixipanipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a98fd63f-7930-4ecf-bd61-ffa4eb6c2207/liramuvuwusit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aef7dcb0-0a2f-4a1d-9594-a7f31e2f005e/what_weight_is_a_medium_sweet_potato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/414393e4-cfc0-4278-9efe-4e822adf8629/how_to_tell_difference_between_bacterial_and_viral_throat_infection.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/5331616058.pdfIn PDF document text
    • http://jiregaruxu.rf.gd/august_month_current_affairs_vision_ias.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a2668e9-fc3a-4962-aec0-c07520f92502/co_teacher_job_description.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ee19f0-102a-4b2a-8d96-fa919486ccf4/what_is_biblical_meaning_of_222.pdfIn PDF document text
    • http://tuvalej.epizy.com/502779065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f72dab-2191-49eb-993c-f3c763b1004b/piano_notes_7_years_old.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/adobe_indesign_cc_2014_trial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b9a46fc-1adb-42ea-8051-325a7e297257/who_is_the_best_beatles_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c15d237-791c-4e7d-ab35-eca7a6b6616b/how_to_record_credit_sales_in_double_entry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/490e6213-a477-495d-a5b9-67c493ee73e4/tikobabo.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_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 5356 bytes
SHA-256: a24829cee8eff94c7ee831af4e468aa539d57e358a3e814a2ae3030ecca65ca7
font_01_sfnt_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 12368 bytes
SHA-256: 4e8b46506d1b9c1aa49d29833ff91ef2739683ee932a88ae7f90f013b7593777
font_02_sfnt_off000119ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EE 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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