Malicious PDF — malware analysis report

Static analysis result for SHA-256 79449776fd74e821…

MALICIOUS

PDF

72.9 KB Created: 2021-02-21 17:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b553fee9f6e1ea22dbc3ec6dbf5334c9 SHA-1: deff2069981a6e5d9e983357b9d8d531f354415e SHA-256: 79449776fd74e82110c91c54a392fffa8506ee6ca6698cca6ab035f3b6a3ea7f
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by multiple heuristics, including a critical finding for redirecting to known malicious infrastructure. The embedded links, such as 'https://yafferge.ru/strik?utm_term=mcgraw+hill+answers+history', strongly suggest a phishing or credential harvesting attempt. The document body contains obfuscated text and metadata, further indicating malicious intent rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=mcgraw+hill+answers+history In PDF document text
    • http://futup.ru/dearborn_heater_for_salemh3lw.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/hCgjfTz/german_order_of_battle_ardennes_offensive.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/jjCbXia/xusorivujapozatupefufa.pdfIn PDF document text
    • http://bigpleasure.ru/how_to_raise_a_successful_child_bookgq14d.pdfIn PDF document text
    • http://gprofights.ru/new_odia_song_2018_mp4nptf2.pdfIn PDF document text
    • http://choosemadam.site/jazotigivakohwook.pdfIn PDF document text
    • http://raicen.com/5074263292403giy.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/7Kge5hc/board_games_online_store.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/saxefi/android_10_nokia_6.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/call_me_a_spaceman_video.pdfIn PDF document text
    • http://molutuganum.epizy.com/91403303629.pdfIn PDF document text
    • http://wijabotivov.epizy.com/45655221738.pdfIn PDF document text
    • http://tisudaxutuz.epizy.com/dizopivovogoletovu.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/jevunegosekarifex.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/bluetooth_software_windows_7.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_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 5260 bytes
SHA-256: 92676bc18b879f1c48295a003ae64c74751c3af122731a01a057129d05a89720
font_01_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 10500 bytes
SHA-256: 3a7b16f20304bf59fff02a47bf672e2bef2729557415db09017412f602489931

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