Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce52e61cc483ebd…

MALICIOUS

PDF

87.2 KB Created: 2021-03-23 05:57:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7744b144e38f2fb43ab16132bf7661ab SHA-1: 21171aa1e487c013656d5215dd1338d13e6755c9 SHA-256: dce52e61cc483ebd32e58f842d6ff601b6d938fc2a886de0aefbb994245334e1
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary focus on the URL https://bologen.ru/wix?keyword=coneheads+cast+and+crew, which is identified as an SEO redirector. Heuristics indicate a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK', suggesting the document is designed to drive traffic to potentially malicious sites. ClamAV detection and ML classification further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://bologen.ru/wix?keyword=coneheads+cast+and+crew PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379614/normal_6033b486d1970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454988/normal_604a9f4da8a7d.pdfIn PDF document text
    • http://leoidet.xyz/line_6_pod_pro_xyzwr8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380392/normal_5fd085bd84749.pdfIn PDF document text
    • http://beach-fruit.fun/34725197100k6b4t.pdfIn PDF document text
    • http://insuranceautousa.com/vafonijekomekedeworilupofw855u.pdfIn PDF document text
    • http://islemleriniz.org/miditisexewepejivizek8saeo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478402/normal_601772637f223.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/dozore/best_compact_washer_and_dryer_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/jesovegujefemibafa.pdfIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_280f708f120746dd827593d144778975.pdf?index=trueIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_f1c300827eaa4fa5a51d2b57e90c2c35.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/wuwotimimav.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/what_format_does_brother_embroidery_use.pdfIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_680920eb758949dbb1ec4ae1095de164.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/ccsp_official_study_guide_2019.pdfIn PDF document text
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_5dc7a086dbf34093a2ad9d2609c9111b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugafebip/penguin_readers_level_3_free.pdfIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_872e4a9067b341d9b076dcd1bf189115.pdf?index=trueIn PDF document text
    • https://63dbeab4-18c6-4677-a808-17cd77aec119.filesusr.com/ugd/963d80_60da4fa0a809445695b74cd0cc26214f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/agrobacterium_mediated_transformation_of_tobacco.pdfIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_2fff4245ad1548f885462dbcd9a695d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mokamoba/what_is_the_major_theme_of_the_book_of_daniel.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/cumulative_sum_in_ssrs_report.pdfIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_0f400b69138e4cfba6c2f584b344196f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jikopot/9986644750.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_off00011882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11882 4992 bytes
SHA-256: f20d719591a45d24b99793451de3505b5e2127be051ed18a9cd9cbcfd5f170b3
font_01_sfnt_off00012981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12981 11016 bytes
SHA-256: bf5293acbfba70bc17c91b4fb8cd7ca122c87c8ef2de446b5a878b06ddac14c3