Malicious PDF — malware analysis report

Static analysis result for SHA-256 1663a582279d5694…

MALICIOUS

PDF

79.6 KB Created: 2021-03-30 16:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bf5023869c54d73d2f5d69b4bd82bc2e SHA-1: a6d97c6ee01329b99d1992f5580735224427052b SHA-256: 1663a582279d56947695212771750900760f25966ccd2fa7c33e06de2fb2f585
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The primary URL, 'https://maypoin.ru/award?keyword=access+bars+kitap+pdf', appears to be a lure for users searching for specific content, likely leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/award?keyword=access+bars+kitap+pdf PDF link annotation
    • https://cdn.sqhk.co/xazewizol/FwnPhgz/biletolodixagezave.pdfIn PDF document text
    • https://tamilifikex.weebly.com/uploads/1/3/5/3/135321075/xuzofo.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/ijhNehh/bolazawaxabuxipoli.pdfIn PDF document text
    • https://wabexerimib.weebly.com/uploads/1/3/0/7/130739061/3641503.pdfIn PDF document text
    • https://mejekuveko.weebly.com/uploads/1/3/5/3/135392268/gepizane.pdfIn PDF document text
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/pulemar_jejidiretazu_vulamuto.pdfIn PDF document text
    • https://mivebomuponi.weebly.com/uploads/1/3/1/3/131398008/b6b584c3.pdfIn PDF document text
    • https://xosebabonewita.weebly.com/uploads/1/3/4/6/134613761/nipopib-wezesamediwusim-vigamil.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/6GSdjhC/best_free_boom_cards_for_speech_therapy.pdfIn PDF document text
    • https://kapefamutom.weebly.com/uploads/1/3/4/8/134849172/5698512.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/hfieihK/52119497050.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/628d22fb-3ad4-4253-91b3-f12e1346f8ce/can_i_replace_the_battery_in_my_garmin_nuvi.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/new_york_state_mandated_reporter_hotline.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/bomixobeporokewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ddbb2c5-3982-4416-b1be-e898d7d243b2/stock_market_trading_guide_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20c02c15-e874-44cb-b161-ddcf55aef32b/examples_of_indigenous_knowledge_in_education.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3e758b4-7cac-49b8-a07d-f409dc1b5fff/rurolopu.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/40183614537.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/toxukagiwekixuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f570c64-ca66-4bed-b222-dcb12b119d3d/how_long_do_you_cook_a_pork_shoulder_in_an_electric_smoker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bacf87ab-1bce-4ef5-9ea0-a9811a511f5d/18590204577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fde697-0095-4033-9ecf-2e3488c32545/the_boy_in_the_striped_pyjamas_book_short_summary.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_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 5308 bytes
SHA-256: 2bf09a8fcd0b596a5dfe85ff2958af9b0721f90d4116448176d903de110a75f5
font_01_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 11936 bytes
SHA-256: bed556ccdd372e2ce57651dbb7bbabff48216659f8f26149d682eed4e61d11ed