Malicious PDF — malware analysis report

Static analysis result for SHA-256 677cb457b68a2c0f…

MALICIOUS

PDF

69.7 KB Created: 2021-02-18 22:34:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 119df87fea63a8b85c3d22a1bcc1043d SHA-1: e58082aae8b2a4d1d22a79dc930ff260fca47d6f SHA-256: 677cb457b68a2c0f2e68ffa4d913980704f9f53b701eebbf2fbbb606526c7af6
196 Risk Score

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://maypoin.ru/123?utm_term=fe+chemical+engineering+review+manual+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382638/normal_5ffad5cf577f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_5fe6de30ae53d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530868/normal_5ffefa18c3568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375703/normal_600a07000083e.pdfIn PDF document text
    • http://tonalemeketav.66ghz.com/portosystemic_shunt_cat_eyes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382430/normal_602d96abd4c3a.pdfIn PDF document text
    • http://wexixexebasober.22web.org/org_apache_commons_collections4_listvaluedmap_jar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488855/normal_5ffc050d98093.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413842/normal_6006e9f596c25.pdfIn PDF document text
    • https://karimimeri.weebly.com/uploads/1/3/1/1/131164281/gifodafiwox-wedetivug-pofima-kijusakopadeje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409103/normal_5feed11b7d88f.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/lusabifef/free_printable_bridesmaid_proposal_template.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/algebra_and_trigonometry_8th_edition_aufmann.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/baby_status_free.pdfIn PDF document text
    • http://vukenorap.epizy.com/94024934800.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF85 5500 bytes
SHA-256: 1094e26de4ba4b6f8440cb03b04010aedbe3181bad3cecae3c8f16054b785aa8
font_01_sfnt_off0000e224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 12604 bytes
SHA-256: 79ba39bc166d21abce63164039849d059723e649a2f013ebdf408b6267821dda

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