Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7bb023ef0a4f0e…

MALICIOUS

PDF

93.7 KB Created: 2020-11-23 08:58:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6c457be24eb29fc75c91acf16a15f615 SHA-1: 1faafe37efe38a3751b0145484015169ee3cefaa SHA-256: 6c7bb023ef0a4f0ea7e81cd886c94085633d2b7c786f4c886ae44c8518011fd8
136 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm, suggesting a malicious intent to drive traffic or distribute malware. The presence of a redirector URL, 'https://trafficel.ru/123?utm_term=we+didn%2527t+start+the+fire+lyrics', further indicates a phishing or malicious download attempt. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest it's designed to exploit users through link manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://trafficel.ru/123?utm_term=we+didn%2527t+start+the+fire+lyrics PDF link annotation
    • https://kufofena.weebly.com/uploads/1/3/4/5/134504524/bulutaj.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/lapolare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f88c605bc421.pdfIn PDF document text
    • https://goraworozegisu.weebly.com/uploads/1/3/4/3/134324811/649230.pdfIn PDF document text
    • https://xifepifedezuz.weebly.com/uploads/1/3/4/4/134495844/aa76711bd6.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/mapanamiwuguwokidari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376379/normal_5f9a2b788089c.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/tiduro/tv_guide_sydney_yesterday.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/a_beginner_s_guide_to_investing_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/layers_of_skin_art.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/cheryl_s_cookies_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/apsrtc_bus_pass_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/captain_marvel_original_motion_picture_soundtrack.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_off00013173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13173 5260 bytes
SHA-256: 1f3c951ce2e7dce83660b2060f6abc7ecb5dd8753c5c39fe7a283bb544b2fa73
font_01_sfnt_off0001436b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436B 11688 bytes
SHA-256: 869a08c95092f72e2133df217be5a8fa4e4d50b0e8fa414b73bfa65fcc92dc45