Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c4f6755687f3f0…

MALICIOUS

PDF

73.3 KB Created: 2020-12-22 20:31:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e2ca1ef6ab1f61272dd88844075dfb33 SHA-1: 97d54bcfd197e5558aff0bf47eedcdd8b3e53ea3 SHA-256: 75c4f6755687f3f05acc51168840661644103f285542fb4028134ecd2dfb3664
254 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly support a malicious classification. The embedded URLs are designed to lead users to potentially harmful sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=boundary+value+analysis+example+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4416125/normal_5fc88b083a482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_5fd83738a27fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_5f8e028856ac0.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1441493.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf53189d7936484084ea75/1606374172537/what_is_vibing.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b2b88139af037665e822/t/5fcf9f7e68c18617d4198f08/1607442302535/cooking_tycoons_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0747435a-4bca-4da7-a5da-ac1ba1f3cf49/dekimakarebixa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc7d305fcdb718a17c69c1/t/5fdd05b065c797038f85209d/1608320433362/radufokafubarotadizen.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/hotmail_email_configuration_settings.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/31924776838.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/cpm_integrated_math_3_textbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/39717626845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99ca05d2-fd08-494c-b996-4ed649401d58/fepipa.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/majixafo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc187916609fd0ee795caa4/t/5fc392523570fb44d1713bba/1606652499249/194801085.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACE 5464 bytes
SHA-256: 0054be915c45e8364853e749a6ebfa31a3b6588a2dacc30e712666a4ecee215b
font_01_sfnt_off0000dd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD63 10832 bytes
SHA-256: 64e0986e6f8630665907d9a5278ccbe8f5c46a759d831e9b9a0b765fba03a7c4
font_02_sfnt_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 16144 bytes
SHA-256: 25dc1b7d69cb91644f28a5d849e004c6f464f5b7ca2df743cc20f0bbd1bcfc9f