Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a87244790148ae0…

MALICIOUS

PDF

78.3 KB Created: 2021-03-14 14:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 453d9ed0b89b200d3dfbb7afea732d11 SHA-1: 9b06283e0204da892b87b0b26c0053f47cd3c673 SHA-256: 3a87244790148ae0771d2e19360a5cf902432170a05465107be0807f2c14a4ee
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one prominent URL pointing to 'maypoin.ru' which is flagged as a potential phishing or malware distribution site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting an attempt to obscure malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/award?keyword=teoria+de+los+aranceles+y+barreras+no+arancelarias+pdf PDF link annotation
    • http://mujuwowewo.22web.org/miwivixijuw.pdfIn PDF document text
    • http://jiwipetafexob.iblogger.org/84269424904.pdfIn PDF document text
    • https://cdn.sqhk.co/podogule/hjpdhjE/missing_411_books_david_paulides.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/fAheujg/garmin_245_race_time_predictor.pdfIn PDF document text
    • http://jasetukuxazep.22web.org/angular_progressive_web_app_template.pdfIn PDF document text
    • https://cdn.sqhk.co/kitolitik/hiphbge/call_of_duty_warzone_wont_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xagazusapikim.epizy.com/26846112807.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_adde929d1c714d25bdcc02f68981065d.pdf?index=trueIn PDF document text
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_e8ab8aba33fe45228793afe294b722e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee940885-9756-41f4-9043-be81b0ed47bd/electricity_and_magnetism_worksheets_grade_4.pdfIn PDF document text
    • http://kupipeda.epizy.com/formal_letter_address_envelope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac2c54fa-fc2a-47e9-8be3-3b49e5b6c70c/44409507281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/141e2315-6716-4fb3-9501-637a7bae5627/civilization_6_gathering_storm_deity_strategy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5350e465-bd18-4978-bdd4-af9229119074/analytical_essay_example_college.pdfIn PDF document text
    • http://safivobuvap.epizy.com/mokamojisi.pdfIn PDF document text
    • http://jijudewaroj.epizy.com/design_of_aerostatic_bearings_powell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/085faf68-ed77-41af-9139-6673491d6a14/zifupokokavorewevuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d99d2d-77af-4a25-ba52-210071413762/46926144553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fabfd7-b497-448c-bbf1-492a08a4adef/how_to_read_a_topographic_map.pdfIn PDF document text
    • http://jamudux.epizy.com/wuvakusibukabevagas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 5048 bytes
SHA-256: d7614180f6db53ef966e9851c79eeecd89f2e7fdb8f8b46bebd0ac3b1f89a907
font_01_sfnt_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 10792 bytes
SHA-256: e5e585ab1661f58f25d58bbb90175765bff267d6444109ec13c793178b8bbe6a
font_02_sfnt_off00011da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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