Malicious PDF — malware analysis report

Static analysis result for SHA-256 b900349f517b969d…

MALICIOUS

PDF

81.0 KB Created: 2021-04-17 21:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 510bb8531ac700c34df9e3e692aa9455 SHA-1: dc98740749b06f7a62ee07f0bf059d992b2a6e5c SHA-256: b900349f517b969d89b557fce4a8f0cdb398ce868cebb599b5c292c308ee42ff
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external URIs, with one specifically pointing to a URL that appears to be part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to 'Avalon 737 compressor', suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=avalon+737+compressor PDF link annotation
    • https://zabaruwizugode.weebly.com/uploads/1/3/4/5/134596412/gadixedoto-vobupu-mijulovos.pdfIn PDF document text
    • https://cdn.sqhk.co/revujinarewu/khhhj4y/benefits_of_drinking_red_rose_tea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_604141f768296.pdfIn PDF document text
    • https://zebewanuvaxa.weebly.com/uploads/1/3/4/6/134613040/vatabagux.pdfIn PDF document text
    • http://pro-gram.pro/bukalote8xc5p.pdfIn PDF document text
    • http://procripton.com/cold_blooded_love_musicrcdhu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485693/normal_60368245b4fe4.pdfIn PDF document text
    • http://13millions.store/muvenuiusir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368747/normal_5fe1c0c36c495.pdfIn PDF document text
    • http://choosemadam.site/harry_potter_and_the_half_blood_prince_why_did_snape_kill_dumbledorebyvkj.pdfIn PDF document text
    • https://lalexitadonu.weebly.com/uploads/1/3/0/7/130776325/mametikoralo-kowiwupojetube-wonezuv.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/8ehgjo8/property_management_jobs_las_vegas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bizedesaxifu.onlinewebshop.net/98590121202.pdfIn PDF document text
    • http://sojusenetuki.onlinewebshop.net/bilute.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/chrome_plugin_json_formatter.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/adobe_software_packages_price.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/tedekuzejitizawojatug.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/solution_set_for_inequalities.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/5238441261.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/wafuwaroja.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_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 5032 bytes
SHA-256: ae0d9309c25c360c8ea8b6355a883693c80c2b30d3dfcb44d72d43c3ad090df0
font_01_sfnt_off000104ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 10556 bytes
SHA-256: 7db80406fb674fee3993acae173d79fda41ec5b9960eed4b2bb1e83fe4ef0d0d
font_02_sfnt_off0001289c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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