Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fb395c1096908a…

MALICIOUS

PDF

81.6 KB Created: 2021-04-16 15:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 46774fb0eb6ddc8a8772d8c0ff243be8 SHA-1: dd5e9b800627bc94e6a89873893ff292a87ec283 SHA-256: a1fb395c1096908a1a508257b52f4bb258a51a1b276f29efb10a79bd66d94f6d
156 Risk Score

Malware Insights

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

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 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.
  • 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=diary+of+a+wimpy+kid+rodrick+rules+pdf+archive PDF link annotation
    • http://iuts.space/acura_service_code_b134oeymh.pdfIn PDF document text
    • https://kanudepu.weebly.com/uploads/1/3/2/7/132740929/2857243.pdfIn PDF document text
    • http://itverys.space/boxing_tips_for_punching_bagq8rzo.pdfIn PDF document text
    • http://boost-shop.xyz/problem_book_mathematical_analysisvkcnl.pdfIn PDF document text
    • https://jumugixaz.weebly.com/uploads/1/3/6/0/136028190/9a50b90.pdfIn PDF document text
    • https://mifoxafakefan.weebly.com/uploads/1/3/0/9/130969175/1cfb19aa04cda.pdfIn PDF document text
    • http://iclod.tech/gevewurigavurxemf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxexi/konirozofezude.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/robert_jordan_lord_of_chaos_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/suwaximufipupukiniv.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/jakewuzin.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/biology_class_10_chapter_2_question_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/70519373835.pdfIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_ff96d3b117a541c5bd27d264e1ffc4d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/captivate_9_32_bit.pdfIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_73fa71dbe2034e67964430a9367cd6f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/can_you_fall_in_love_with_36_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/sojidanisapuxakagiluju.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/42965800402.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/44892942329.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 5712 bytes
SHA-256: 3b978c4437cb0aab35fa15cd036ba00de5c343a9500f917398a5424ccba4b75d
font_01_sfnt_off0001118c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118C 11084 bytes
SHA-256: 247e9bbfdfd1dd52011f9f5eca4595cddad1a37577c8b37b9d6c1dbf5f189c65

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