Malicious PDF — malware analysis report

Static analysis result for SHA-256 18deb967b9fe8ff9…

MALICIOUS

PDF

67.6 KB Created: 2020-12-16 23:04:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 710919242cefeaab1e83f4e82088fa86 SHA-1: b2731c735a792a7ef8cb099dba098c0d997f91ad SHA-256: 18deb967b9fe8ff949bba19c4d98369a33f7d57530c2feecdd7d2a93f0faaf92
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple links to redirector infrastructure, including 'traffmen.ru', which is flagged as malicious. The document body, though heavily obfuscated, contains text related to 'free prizes for students', aligning with a phishing lure. The presence of numerous PDF links suggests a link farm intended to distribute malware or lead users to phishing sites.

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://traffmen.ru/123?utm_term=free+prizes+for+students In PDF document text
    • https://cdn-cms.f-static.net/uploads/4486975/normal_5fc2c268b935f.pdfIn PDF document text
    • https://fabevapomuwi.weebly.com/uploads/1/3/4/6/134607330/xorikuzotilumod_kaxemu_savakiwetufa_novesaduvun.pdfIn PDF document text
    • https://pevexozu.weebly.com/uploads/1/3/4/8/134857768/2312564.pdfIn PDF document text
    • https://nofakuxuwuxow.weebly.com/uploads/1/3/4/6/134684799/3817791.pdfIn PDF document text
    • https://vubinejenifa.weebly.com/uploads/1/3/4/4/134444695/kotowanijaxuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412768/normal_5fd2a9c81ea47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370767/normal_5fc3c8cba8072.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/f61a7226-96a8-405c-8fc8-8c9cd77576be/xenizinudesesedose.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4e694085bf90c0e16c363/t/5fc5b02c1972c46e3c636092/1606791213880/18th_century_letter_format.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc11ea5a87939686409a0fa/t/5fd158a7071bbc68801a69fc/1607555239835/19135550347.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce1e8a790d063a90a90c5e/t/5fd60f365488895576a21536/1607864118749/arithmetic_mean_for_grouped_data.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1b24012facd59ceb28ac7/t/5fcd4629260a660a6be8ad23/1607288362181/bofevelobejirovanebavowoz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51b2d405d5340f344d547/t/5fd11bcc10275a0b908d804c/1607539661690/vikings_cast_season_3.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd308239b0722912b0841/t/5fc1336b18e72e5fdb02c72e/1606497132104/national_high_school_rodeo.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_off0000cbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC6 4800 bytes
SHA-256: d5b855a1b779c4f0284d869bd0dfdfce3ec3a0d8aac25418a3ecbcd74cd11e10
font_01_sfnt_off0000dc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC34 10932 bytes
SHA-256: 9445eeb7650303eb9487e0ad1b05e055895d7ebf63ae07008efdba17522e2403

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