Malicious PDF — malware analysis report

Static analysis result for SHA-256 113d08fca2230aa0…

MALICIOUS

PDF

86.2 KB Created: 2021-05-19 17:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c480ff21a97b1ee9f7a7955c3f4295da SHA-1: eee7d7e7eea26455199fe42f6b0e4bb3499492e6 SHA-256: 113d08fca2230aa01ebd4955e8ce2df5fc8f7b44af2722503af6846ba2aa27cb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated SEO content, indicating a link farm designed to drive traffic to malicious sites. The primary malicious URL identified is https://gimoguvi.ru/strik?utm_term=how+to+put+a+belt+on+a+whirlpool+cabrio+dryer. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/strik?utm_term=how+to+put+a+belt+on+a+whirlpool+cabrio+dryer
    • https://nonujokos.weebly.com/uploads/1/3/0/7/130775252/3448536.pdf
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/libuzizeduwixijidaz.pdf
    • https://bawozumop.weebly.com/uploads/1/3/1/4/131452782/3616899.pdf
    • https://tinofapilasi.weebly.com/uploads/1/3/4/5/134518201/9152634.pdf
    • https://metekubop.weebly.com/uploads/1/3/1/4/131438843/pafared.pdf
    • https://nateguwab.weebly.com/uploads/1/3/1/4/131453796/d296b374.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rizijubovapuk/6268725715.pdf
    • https://uploads.strikinglycdn.com/files/6944cc85-ad32-4e7d-b0ca-951d5c6071f4/21023001277.pdf
    • https://uploads.strikinglycdn.com/files/2134a440-1553-40e4-b7dd-4ce3db358b39/characteristics_of_life_worksheet_answer_key_biology.pdf
    • https://uploads.strikinglycdn.com/files/737ddc24-83a3-482f-ba11-e94f454fa4bc/nostradamus_hailed_from_what_country.pdf
    • https://s3.amazonaws.com/nowonovege/electronegativity_and_bond_polarity_worksheet_answers.pdf
    • https://s3.amazonaws.com/jopomodilamego/wunodepebuwapugi.pdf
    • https://uploads.strikinglycdn.com/files/77631369-528d-44b7-af59-2d1fe996a01e/what_is_the_poem_still_i_rise_about.pdf
    • https://s3.amazonaws.com/fajeloninesitel/watch_war_and_peace_online_free_123movies.pdf
    • https://uploads.strikinglycdn.com/files/428d1312-6177-49b9-b0e1-5634979ec088/vicks_warm_steam_humidifier_cleaning_instructions.pdf
    • https://uploads.strikinglycdn.com/files/9d309e15-56a6-4e97-a851-1a0a16987aac/51088188297.pdf
    • https://uploads.strikinglycdn.com/files/4b786903-7aff-4bf3-a3fa-7cb70c6a426a/without_remorse_based_on_book.pdf
    • https://uploads.strikinglycdn.com/files/2c05b66b-e4c1-4ac5-9010-9c12ba767bf3/stihl_ms_261_c-mq_price.pdf
    • https://uploads.strikinglycdn.com/files/6e2527b7-8cee-4758-b08c-215d3e99b5b0/burger_king_2_for_60.pdf
    • https://s3.amazonaws.com/bejeseja/perioral_dermatitis_treatment_guidelines.pdf
    • https://uploads.strikinglycdn.com/files/41dc0ece-bbab-401e-b014-1d346c896bf1/libros_gramatica_ingles_basico.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011310.bin
6c392d1ce1c6d3a68a955c70d58d988e254815930da0045ee71e857eed7e9958
pdf-font-stream PDF embedded font (sfnt) at offset 0x11310 5280 bytes
font_01_sfnt_off00012506.bin
f17f69551519a07f8ebbe0f059227c1e6be07afcedb8f7f81e0b0e431bbe5f71
pdf-font-stream PDF embedded font (sfnt) at offset 0x12506 11488 bytes