Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e75b46373492a79…

MALICIOUS

PDF

83.6 KB Created: 2021-03-18 05:55:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3de0707fe9b80a3d2a9af469036bea81 SHA-1: 733d0fcb925c8fe77c1f88302269e355c0941c32 SHA-256: 7e75b46373492a7936f49b2824ae7cfba1f0e6527cca4e5d44cbfc62eeaf9c75
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'worksheet answers', indicating a phishing or credential harvesting attempt. The presence of external URIs and the overall structure are consistent with a malicious PDF designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=the+plant+kingdom+worksheet+answers PDF link annotation
    • http://normaa-id.com/what_are_the_chemical_properties_of_oilo94bi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_601aa5f0c710d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402721/normal_602440c2e0e05.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/the_school_donald_barthelme_setting.pdfIn PDF document text
    • http://ruginegil.22web.org/azhage_azhage_song_wapwon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_6014d75e5b35b.pdfIn PDF document text
    • http://kamini33.ru/how_hard_is_it_to_learn_lacrossep03fh.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/d052ec00-a58e-4ad3-8ed7-20854697b295/what_washing_machine_has_the_shortest_wash_cycle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69d26578-c703-4b0b-990c-e355a22b9502/adobe_premiere_pro_2017_crack_reddit.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/winter_survival_kit_for_car_amazon.pdfIn PDF document text
    • http://gogositanisewu.rf.gd/47310335704.pdfIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_9e4637ef723d48418c9cb64777e506db.pdf?index=trueIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_7ea7be56f5cd4e939adf49877e9aebb3.pdf?index=trueIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_494a1fec55a84d139554f9ecd6d8f0a5.pdf?index=trueIn PDF document text
    • https://c22e5cf4-338a-4003-9cad-c1cb0be29285.filesusr.com/ugd/3db607_8cc240d2271140cdb933ce9564e2ed14.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/35cd83b1-edd8-443d-a3b6-25bc3083e8e6/masters_degree_in_public_health_administration_salary.pdfIn PDF document text
    • http://widifusi.myartsonline.com/ir_table_functional_groups.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/198e2267-abb7-4112-919c-118204101e2d/homelite_super_xl_925_chainsaw_for_sale.pdfIn PDF document text
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_37c2cd90209548259ee39238d53cf2d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e70f9b64-85cf-4c84-87d1-37deae4797ad/348582622.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_off00010a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1C 5476 bytes
SHA-256: b498114bcb4b0b9b6741cfb6395278a49c726271eac1fbfda9dc28c490116117
font_01_sfnt_off00011ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA4 10552 bytes
SHA-256: ffc323a5d29f8d189ac5ff4bce0f14ec8e28bb4481de3b48eb1c57dbfc39f080

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