Malicious PDF — malware analysis report

Static analysis result for SHA-256 17369bbdef3c1cd5…

MALICIOUS

PDF

66.3 KB Created: 2020-12-14 11:58:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6ad0f075a1bbbb109febf5bf101f84b9 SHA-1: cdb1d732003b948f9d8b03e45c52e199672a4a2f SHA-256: 17369bbdef3c1cd5e22cfc54437eb500c4222427ff12114ccddde20f47ef516f
254 Risk Score

Malware Insights

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

The PDF contains numerous links to redirector domains, including a critical finding of a malicious redirector at 'https://cctraff.ru/123?utm_term=metro+multifamily+housing+association'. The document body, though heavily obfuscated, contains text related to 'Metro multifamily housing association', suggesting a lure. The presence of multiple embedded links and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or malware delivery.

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
  • 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://cctraff.ru/123?utm_term=metro+multifamily+housing+association In PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/talunebujazuxinubuk.pdfIn PDF document text
    • https://tozafutesaf.weebly.com/uploads/1/3/4/9/134900259/8878630.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6da960b9-060b-419d-bd61-81c9f561d21b/bexike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82f3e55c-4f40-41be-be30-3c4695db6687/mabidakedawifojelarezofas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ad20b75-9e28-4c1c-aa5d-31130dc21028/holt_psychology_principles_in_practice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0746d353-49a6-4ccb-99db-86856a9e6fb0/84638246566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37966401-19ac-402a-9a5e-8f747897bc6b/xaxiteguritafewukobatu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b413ff13940aa260656e/t/5fc9e8c9be6684539ded748b/1607067849784/anger_of_stick_4_mod_apk_an1._com.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75a2f558-308e-4527-b7f7-a33fd1f78ee3/phobia_of_frogs_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6c4d3da-098e-42a1-90a9-f475db02888b/viveditumonovuwilogavul.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/pudekurofakovalesara.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc052d83dfdd95b60d21819/t/5fc6c272b7521d608a2e9515/1606861436124/libro_el_arte_de_la_guerra_frases.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc67c172e34347c706ae803/t/5fd059d4cb6bfe602c4e3dbe/1607490004525/rply_anonymous_message_for_snapchat_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/carbonate_rocks_classification.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce7a3f71026b035386f77c/t/5fd1b34dc10336458b357788/1607578446114/love_to_the_moon_and_back_necklace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd71f92-c87c-404e-8d8f-55d496d52b3f/73306756490.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_off0000c521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC521 5404 bytes
SHA-256: f7aa22e54f33260595d769b04b4c9cff5537f3d6f5589b7b689a5262a7bf6730
font_01_sfnt_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 10896 bytes
SHA-256: 5113edb6c6836c9f613539ed6e9eb44058d909ef93629e7d7d58c83ada664f06