Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c975b9909f894c6…

MALICIOUS

PDF

82.5 KB Created: 2021-03-24 15:22:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e63fcc481687d51ea3b8ae139d8f86e4 SHA-1: 30f5bf4319b805809b7d73f9d5a4f68939499e80 SHA-256: 1c975b9909f894c6080825a180d9359f1e07fc75f1cb915c047ddbdb5eff6374
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. One prominent URL, 'https://botokaw.ru/wix?keyword=download+snaptube+apk+for+iphone', indicates a lure for software downloads. While no scripts were explicitly extracted, the PDF structure and extensive link farm heuristics strongly suggest malicious intent, likely to drive traffic to malicious or unwanted content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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=download+snaptube+apk+for+iphone PDF link annotation
    • https://cdn.sqhk.co/rumoligodo/h3jb5jf/33488459584.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/TLUaifQ/10333220418.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/ijfDjhs/7970798771.pdfIn PDF document text
    • http://jalakerag.22web.org/my_family_worksheets_british_council.pdfIn PDF document text
    • http://felulam.22web.org/sumokonufexapufo.pdfIn PDF document text
    • https://cdn.sqhk.co/sabiwizi/YhbQRl7/russian_front_sight_gas_block.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/dnhgia2/mountain_bike_xtreme_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/nheZsjg/noliteti.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/s4LFjek/sms_forwarding_service_vodafone.pdfIn PDF document text
    • https://cdn.sqhk.co/noretokujazo/hghhoa1/migowefagokafawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zetitovafe.rf.gd/windsor_smith_platform_heels.pdfIn PDF document text
    • http://tuwafuvokix.rf.gd/how_to_unlock_lg_tracfone_flip_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/limiting_reagent_lab_report_answers.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_265c20be808b49a98f7f6af6abd0f75a.pdf?index=trueIn PDF document text
    • http://segalemu.epizy.com/approaching_the_unknown_full_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/chitralahari_naa_songs_ing.pdfIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_f10fa804ff03492392809fbfab3f64ee.pdf?index=trueIn PDF document text
    • http://timadulikojig.rf.gd/basking_ridge_weather_report.pdfIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_d4d173c2038642ff8816872a0032653c.pdf?index=trueIn 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_off000103f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F2 5424 bytes
SHA-256: ec09faf4eceabfdcd5817193afdc2c30647267c01f54485b2085a42028f5c573
font_01_sfnt_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 11236 bytes
SHA-256: eed439c16fd626ab90f1084da5e49e283c62ec7d0626c6d6db44130e919774a1

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