Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e2c5c07079cd66…

MALICIOUS

PDF

73.2 KB Created: 2021-02-23 16:40:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3e1052a0fab713b7e969abc6dac70c09 SHA-1: ba71e081e9094e048c0362089dd5b1095fcf6ba0 SHA-256: 31e2c5c07079cd6634e3793773265d7e7a6af107b1b10606838f3642718c975b
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, suggesting a link farm or SEO spamming operation. One of the primary external URIs, 'https://baarspo.ru/strik?utm_term=how+much+does+a+new+gas+golf+cart+cost', is suspicious and likely leads to malicious content or further redirection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://baarspo.ru/strik?utm_term=how+much+does+a+new+gas+golf+cart+cost PDF link annotation
    • http://itgermany.net/robert_greene_marriedqjzia.pdfIn PDF document text
    • https://fuvobavan.weebly.com/uploads/1/3/1/6/131637325/c702d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_6031c63d137e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407994/normal_5ff9ffe61b3e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423752/normal_5fdf47b354737.pdfIn PDF document text
    • https://nulumekut.weebly.com/uploads/1/3/4/3/134373747/8856988.pdfIn PDF document text
    • http://usacarins.com/turebifoveda1b3kl.pdfIn PDF document text
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/bipubawufivomejazo.pdfIn PDF document text
    • http://slamelina.website/msds_sheet_for_ivory_liquid_soap3jiw4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478387/normal_5fe54d49ed5ba.pdfIn PDF document text
    • https://foseludi.weebly.com/uploads/1/3/4/5/134592848/rideditiretexila.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417032/normal_600c789c6c014.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/widiku/2018_hmda_demographic_data_collection_form.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/vidmate_apk_mod_rexdl.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/why_is_my_frigidaire_water_dispenser_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/blouse_designs_2019_latest_images.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/boy_scout_uniform_inspection_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/41150987094.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/mizedokexosati.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_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 5488 bytes
SHA-256: 80bdf74d0cd04e20b8b98ac640726eeecfcfc1394160c855d84cded2fa558ce1
font_01_sfnt_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 10540 bytes
SHA-256: f199632d1e825ca48a009046babaf7200511cbbd2d31e16ca4cfa784c144d8f4

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