Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d02301bdf550c8f…

MALICIOUS

PDF

74.6 KB Created: 2021-03-30 12:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5c37935f07ed7410f98a33111e013e13 SHA-1: cfa3882dfa83e53342f3c3dc216af6844d1b8b93 SHA-256: 8d02301bdf550c8f5d977d64dfc604e7132d4395311eb1f1add4bf03d136e1f7
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm, indicating a phishing or malicious download lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly suggest this intent. The embedded URL 'https://fokemale.ru/123?utm_term=breakneck+apk+unlimited' is identified as a potential redirector for a free download, likely leading to malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, possibly leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/123?utm_term=breakneck+apk+unlimited PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495269/normal_60298b9229bbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478146/normal_5ffa35998d75f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369917/normal_60034fa9762ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446765/normal_605d723d8afe9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_d688f24c45c54682800e0e93f703a628.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b5763f-cf9d-43c2-9f5f-5a92b37b2b6e/what_are_the_benefits_of_bilingual_education.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/mammut_smart_alpine_guide_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/request_transunion_credit_report_by_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/factorytalk_view_me_version_12.pdfIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_e65e9d7940cd443a9b35b420fdec9a4c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0973a2b-a9d8-45b9-a73f-dc76a64bf2c1/how_to_analyse_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/robuporuliwavar.pdfIn PDF document text
    • http://tutelewelar.rf.gd/storytelling_photography.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/5818200130.pdfIn PDF document text
    • http://numotuvafoja.epizy.com/66667561808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a0ef2ab-5b31-4cf7-9f02-aea991f9cd83/el_pollo_loco_taco_al_carbon_nutrition.pdfIn PDF document text
    • http://dimizisunope.epizy.com/amplictil_ampola_bula.pdfIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_ce1f707ce9c04481b3d37041dfcd795d.pdf?index=trueIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_496d30d5a87d4cbab2a55d89fc3894d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/nexitesidawixiwol.pdfIn PDF document text
    • http://wumekupewug.rf.gd/lemoxaxi.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_off0000e3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F9 5156 bytes
SHA-256: 2d4b58df9b288dbc27929eb5953cd80eccbc33fff10c99fb2da4a7b275fdb6ac
font_01_sfnt_off0000f56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 11476 bytes
SHA-256: 2162dbcbda3c49424374d22ea8c90587341ad5cfc68be5ba97ac3c33e9f0be61