Malicious PDF — malware analysis report

Static analysis result for SHA-256 701b943c8653ab3a…

MALICIOUS

PDF

94.5 KB Created: 2021-03-24 08:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0443347eb14b01b7fe1fd3241afa284c SHA-1: e49805ef63bdf05592edece5b0d312ead0714345 SHA-256: 701b943c8653ab3a1f2e9c1f0d8af6c97d3506531fad08674472a882d224450c
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The primary malicious URL identified is 'https://vilenefex.ru/123?utm_term=asterix+and+obelix+comics+in+bengali+pdf', which is likely part of a phishing or scam operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/123?utm_term=asterix+and+obelix+comics+in+bengali+pdf PDF link annotation
    • http://opssmall.space/dks-501_fallout_4bxrjc.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/caging_skies_download2nd3x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://679cd94f-bb1f-411a-9684-d99498fe93d6.filesusr.com/ugd/ce16d4_65815805deef4353ba0e5de9cadcd867.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c70c4d2-59ae-4b4f-88d4-11f7d57fd2dd/text_file_to_html_c_write.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b6f051-5c53-4909-be47-ff07c4c18dd7/32960893457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ca35cbe-48a8-4892-be89-21e488b58406/54483110568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10fa86d9-8bff-4016-bc62-2486bd13c0b9/27784685074.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_9edd4aadf47c46eca5e75842c1374563.pdf?index=trueIn PDF document text
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_adf8e60152ec437d8e2b2b59e5c3beef.pdf?index=trueIn PDF document text
    • http://madigekole.onlinewebshop.net/bin_sachivalay_clerk_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bddef84-168d-42d0-b529-205e52428ec4/battery_lg_optimus_l90_d415.pdfIn PDF document text
    • http://nudagimanefej.atwebpages.com/artificial_intelligence_seminar_topic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f213c8d-9c33-4ed7-9e8a-a446626a6062/26777111033.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f08e70e1-6e01-433f-8845-52543ff755be/rugiluw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e913471d-9bd3-482b-ad18-674bc6a280b7/givapebibesinun.pdfIn PDF document text
    • http://bitenozof.atwebpages.com/percy_jackson_lightning_thief_book_chapter_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63a6e7ce-2ae9-4f99-a99b-eb094556d149/how_to_draw_a_dog_realistic_but_easy_step_by_step.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_b075f173f0e14b6da65300cf3ebf205d.pdf?index=trueIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D4 5672 bytes
SHA-256: 6fef8fe209f6426fc3b4ff595b96d32b3903d51f5f6635efca1ec7965ca8a60e
font_01_sfnt_off00012605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12605 9780 bytes
SHA-256: 309e3b0777005adcf66068aa598541b0dfe8d339741ac14d77c0ff3fd7180635
font_02_sfnt_off000144a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A3 11592 bytes
SHA-256: a0e1fe0e64e2b4a87e0ac42739b1dcd249827af462aa54eda369a0695bf4e432