Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff11edc7724d7072…

MALICIOUS

PDF

124.7 KB Created: 2021-03-24 06:04:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 356de5aaecc24cab4b1c60c7fc7a832a SHA-1: 56f298450b29f22118415acfa82bbf70db7fb5f5 SHA-256: ff11edc7724d70726f2a7ce4548cc1fec769ddb3842155c353043b4258f41c5e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it's part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The presence of multiple disposable domains and the overall structure point towards a campaign focused on distributing malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://botokaw.ru/wix?keyword=poverty+inc+worksheet+answers PDF link annotation
    • http://worldthailand.fun/berserk_chapter_362_release_datevx812.pdfIn PDF document text
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/kijiwelokiwax-pinakal.pdfIn PDF document text
    • https://fijuzezakuxulow.weebly.com/uploads/1/3/5/3/135391315/258cba7d0e2a8f.pdfIn PDF document text
    • http://islandlandscapesbb.com/tiny_house_building_codes_canadadkkbh.pdfIn PDF document text
    • http://app-3null.com/how_to_replace_sprocket_on_homelite_chainsawdyiui.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/hgvjhje/whipped_cream_cake_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/jogowijalaro/gghbje1/head_soccer_hack_ios_no_jailbreak.pdfIn PDF document text
    • https://zepazilarewar.weebly.com/uploads/1/3/4/3/134310653/afa7290294.pdfIn PDF document text
    • https://biwamuneluzotip.weebly.com/uploads/1/3/2/6/132696598/jidezinejuno_retatalodap_dejutugolimi_tesuvojugedodan.pdfIn PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/4a0f88f.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/cDrBgdI/la_liste_de_schindler_histoire_vrai.pdfIn PDF document text
    • https://jorogusanige.weebly.com/uploads/1/3/4/7/134715450/kukufefep-simutit-puberedikilurom-lavew.pdfIn PDF document text
    • https://losaburi.weebly.com/uploads/1/3/5/3/135322327/mejelige.pdfIn PDF document text
    • http://dkblogin-de.com/how_to_prep_for_sat_mathwoceo.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/a535f2b8-9357-445e-9bb3-4e26d2343109/86839620384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44d5286d-6d1a-466e-9585-ce5a7fa94622/ryobi_1700_psi_electric_pressure_washer_leaking_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58f0daff-d081-4a87-9ed5-c49db7c9312a/6534379237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e861de-ac14-40b7-a1b1-90e4a04a5d5c/amazon_kindle_4_update_firmware.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_off0001ac9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC9E 5172 bytes
SHA-256: 61d70b55d5d4a90e34864527cfff3d51f7db0bab9d0eb6e20950ed2c48439c0f
font_01_sfnt_off0001be51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE51 11112 bytes
SHA-256: e06a5863bf37fa545147061fa7a0f52ce4229bba340a8a6e4a93d1d2077ab3bf