Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42feca08bc9cbd5…

MALICIOUS

PDF

106.3 KB Created: 2021-06-08 04:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 69855560a293a91efe15caa2195ff068 SHA-1: c39e549a3880cbd599d5a907df350dad8880a3a2 SHA-256: d42feca08bc9cbd5a811c24e56bd1a055ac01c7f1cc570a8f2fdb1f4bb519f90
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document's content, though heavily obfuscated, appears to be related to "Asco cancer pain guidelines", likely a lure to encourage clicks. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=asco+cancer+pain+guidelines PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467601/normal_5fe5bac341d28.pdfIn PDF document text
    • https://ramekozedu.weebly.com/uploads/1/3/4/8/134852530/tizevenudopif.pdfIn PDF document text
    • https://katifakemu.weebly.com/uploads/1/3/1/3/131381151/75bf26f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411691/normal_606a2b7828e37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454973/normal_60047b1021fa4.pdfIn PDF document text
    • https://kilosite.weebly.com/uploads/1/3/0/7/130739696/zujulatafu_fekilinatup_tosowibis_bavek.pdfIn PDF document text
    • https://mokekisinuru.weebly.com/uploads/1/3/4/3/134366850/gotimobufufamofer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_5fd2413ca228b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457570/normal_5fd7b2f83fc2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484635/normal_606df3fa44037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478134/normal_6060257247dbd.pdfIn PDF document text
    • https://papekukikaduli.weebly.com/uploads/1/3/4/3/134361343/depijav_podararefi_sozufebotiwil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375696/normal_5ff3810737522.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/7366507a-9032-4f07-b7a2-d65e33adcc50/karobesovomoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e6cbb4-9312-4e2c-8375-7f313254464e/dumiropidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e698b51a-9bab-44f4-a367-e85b34fec64b/20009064400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d01adfc5-a7ab-48ad-81f7-cf83207564c9/grade_3_math_worksheets_addition_and_subtraction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/775747bb-8703-4c71-b161-cb7dbf3f424c/63577291397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77509487-d6c3-4f7f-b5d8-4c096a18dd7f/58100965548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d9b7ec-5d98-4e23-ac81-343f709fda99/vufonesum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d3398f9-0275-4fc1-890f-c2adb094feda/69038265945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9b97c8d-b63c-4e00-89b9-3b06271a90ce/97408270165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a361a68-6440-4ca1-9ede-5dd33d117424/valulixolabekim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b802ae8-db6b-417d-a63e-22324519e63f/leganirelusaxolamale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d27d0b6-9340-4ead-9997-dbc3a8004ac4/how_to_change_the_time_on_a_citizen_blue_angels_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6268b62b-9eeb-4007-b1cc-fa3b787f40f2/molarity_example_problems_with_solution.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_off00016159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16159 5232 bytes
SHA-256: 30d52bcaabdf678194f607d8660a9acebac553b21cb9d3469d7ebd17795e05a2
font_01_sfnt_off00017334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17334 11672 bytes
SHA-256: e1fc7ac94cc4518cd0d495a05b5e8e7157837f81e0ceddde2c7573db73b49823

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