Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a24760a8e39223…

MALICIOUS

PDF

78.9 KB Created: 2021-04-04 07:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1c7895d0562baf12c4785bc4fae72659 SHA-1: 2a8a6fedbe244d2943199fb272154a862ce3a644 SHA-256: b9a24760a8e392239f9de947455318b5a65ff8838c044095e2fef49ea49604cf
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, 'https://xajibur.ru/strik?utm_term=the+heiress+chinese+drama+ep+18+eng+sub', appears to be a lure related to popular media, designed to entice users to click through to potentially harmful content. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xajibur.ru/strik?utm_term=the+heiress+chinese+drama+ep+18+eng+sub PDF link annotation
    • https://lagipadule.weebly.com/uploads/1/3/5/3/135301279/5f13e13f8c2.pdfIn PDF document text
    • https://balolemarivapi.weebly.com/uploads/1/3/5/3/135309218/gegawujeti.pdfIn PDF document text
    • http://carbackseat.site/art_book_dark_souls_3_design_worksnec04.pdfIn PDF document text
    • http://sugebowupubixo.mypressonline.com/gujitobudevukasare.pdfIn PDF document text
    • http://afracheat7.xyz/90625988744h1kzc.pdfIn PDF document text
    • http://fizifuzusizez.iblogger.org/1992_lexus_es300_engine_for_sale.pdfIn PDF document text
    • https://zuligaxexepe.weebly.com/uploads/1/3/0/7/130775912/9665987.pdfIn PDF document text
    • https://jutijodofolumel.weebly.com/uploads/1/3/4/0/134012985/d4674b58e1625f.pdfIn PDF document text
    • http://libertinemodels.com/manorama_calendar_2020lscbz.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/literature_an_introduction_to_fiction_poetry_and_drama_ebook.pdfIn PDF document text
    • http://kafalukuwemi.mygamesonline.org/34128215520.pdfIn PDF document text
    • https://fusazalokedukek.weebly.com/uploads/1/3/4/7/134729088/vivaxuji.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/525e11c2-9d6a-4cff-9c9c-255843374fe1/is_there_going_to_be_a_revolution_in_the_us.pdfIn PDF document text
    • http://bidusibebawuz.onlinewebshop.net/galetuk.pdfIn PDF document text
    • http://kizosit.rf.gd/kofobuvidejaset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe102b66-968c-40df-b30b-65825b53fb6d/9525428904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/725dd80c-eb7b-4ba3-b490-fdc14b371eab/99274874473.pdfIn PDF document text
    • http://badivisixeg.epizy.com/nusimeruwanowudup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fe8de92-deaf-4674-96f1-b227ba467557/xemuxaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f52d27f8-1cf9-4063-9794-2643e21b2494/lewelujivemarewan.pdfIn PDF document text
    • http://xurosuforudev.atwebpages.com/good_synonyms_formal.pdfIn PDF document text
    • http://munoxefarofow.rf.gd/famup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/684f63fb-c33e-4084-8a59-08fabede2192/14139652971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/432ae4f1-d845-4097-9e78-a65ed3671702/computer_hardware_engineer_salary_per_month.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_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 5192 bytes
SHA-256: 2bb2ca37ea248979e2fc993cd041e0def33e63393deed15693be54037a462a4a
font_01_sfnt_off0000f532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 5792 bytes
SHA-256: a60efd4552cf74e8b05c9ec19b784657d4034a8ff1cea1365d1ac4b82417a72a
font_02_sfnt_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 11496 bytes
SHA-256: 098ebe234d9eda1de71b71b0c67d4078b65f7e89afaab2955a6ca2add72ac00f

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