Malicious PDF — malware analysis report

Static analysis result for SHA-256 6290579f90638bf9…

MALICIOUS

PDF

71.3 KB Created: 2021-03-07 07:48:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f49a9c428d1ab950788bfbdfe395d8e8 SHA-1: b6b98d52b40b4d2e767fdef57f92400fbffb9e7a SHA-256: 6290579f90638bf98a3da587ce048c7f8b05e6377dec4b13e808805ffffc5e5f
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a prominent one identified as an SEO redirector for 'free-download phishing'. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malicious content.

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/123?utm_term=bissell+proheat+12+amp+dirtlifter+powerbrush PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470224/normal_5fd81dba9015a.pdfIn PDF document text
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/nesejamomem_buwoxawevigaz_zuwinimeg_xovujovubogijev.pdfIn PDF document text
    • https://tadeliganunuzax.weebly.com/uploads/1/3/0/9/130969808/nomamopobunale_mimexule.pdfIn PDF document text
    • https://rozeravepirasaj.weebly.com/uploads/1/3/2/8/132816036/956cf9982b161.pdfIn PDF document text
    • https://givadebar.weebly.com/uploads/1/3/1/4/131437750/620de8b64a48919.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445735/normal_5ff6643ba5f38.pdfIn PDF document text
    • https://nipoxumafoji.weebly.com/uploads/1/3/4/7/134717148/nafujitiwa.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/ghlVigO/72365753890.pdfIn PDF document text
    • https://jameropavide.weebly.com/uploads/1/3/4/6/134699307/527792.pdfIn PDF document text
    • https://vilavabakawo.weebly.com/uploads/1/3/1/6/131607043/rameji_rodimeja.pdfIn PDF document text
    • https://cdn.sqhk.co/bupedamarib/hbgxjEO/battle_strikers_website.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458389/normal_5fd178542bd24.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/tawosutosuxi/how_to_produce_biodiesel_from_waste_cooking_oil.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/avengers_infinity_war_soundtrack_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/black_veil_brides_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/96122612196.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/barisal_district_map.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/akhisarspor_forma_2019.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_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 5744 bytes
SHA-256: 7199f32e7e083f0fdada996bf44b86ba82561492a1df31378a4edbc80f1e0fe0
font_01_sfnt_off0000ed30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 10036 bytes
SHA-256: cb527d00fe0d99d98d321fc4ffef3fa21078ac33da71e66fb2cc1a0c3c448b2c

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