Malicious PDF — malware analysis report

Static analysis result for SHA-256 e221977558e68744…

MALICIOUS

PDF

71.6 KB Created: 2021-06-08 06:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c46d313ba45e7b3787751243c3f30643 SHA-1: 9f87b1ae7a875407c7b5cb040de27a1612aaefcc SHA-256: e221977558e687440696c6774b236b947b68d8cf05c7559dd21b357e808fdb09
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://pistant.ru/pbw?utm_term=r410a+superheat+and+subcooling+chart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490265/normal_60145f1dcae28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367296/normal_5fce404b8c0c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486199/normal_6017fa6acad25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482849/normal_5fee75ab4b03c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417418/normal_6021bd033e318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453550/normal_6063e2b990f95.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/b7deb5d1-cb32-4382-818b-ee5b24508e08/gusidapolisipexenufoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e07442db-6095-4b60-8313-e8d323ed63d7/guess_brand_game_answers_level_2.pdfIn PDF document text
    • http://zigunef.pbworks.com/f/joseph_daniel_unwin_sex_and_culture.pdfIn PDF document text
    • http://bokibagaror.pbworks.com/w/file/fetch/144833382/electric_go_kart_uk.pdfIn PDF document text
    • http://jitilabajeko.pbworks.com/f/what_does_error_3_mean_on_relion_blood_pressure_machine.pdfIn PDF document text
    • http://joraxakegeg.pbworks.com/f/kingdom_death_monster_rules_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/186cce76-c923-46ce-8ea5-a454c7d74817/vetanirediwaja.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/f/tuzepuv.pdfIn PDF document text
    • http://pexovobef.pbworks.com/w/file/fetch/144672525/interstellar_movie_hindi_dubbed_download_filmyzilla.pdfIn PDF document text
    • http://supijexed.pbworks.com/f/xopapoguwajomoguwaxedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a59c0c-40a2-4667-97f7-d1e353747722/how_to_use_aroma_rice_cooker_10_cup.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_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 5764 bytes
SHA-256: ff574da069b223b09fdce1fe8cb5db0031b38082ca0c567aea1368e74c841ec0
font_01_sfnt_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 11228 bytes
SHA-256: 114966a01e704c979b7ae7d77846bac8bd1aef5f965de2a41b6f8f39f1927a4c

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