Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8f56a6bbcfd8de…

MALICIOUS

PDF

78.3 KB Created: 2021-03-05 04:09:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f481615a52a6e656a4118e834c8af8c8 SHA-1: b85d4debd7b8aadcd5e5604bdab9fd4f5dfcc525 SHA-256: 9e8f56a6bbcfd8dec63dac3bb3d69692ce4db33e3f504d3db4af53ddf89b7663
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file functions as a link farm, containing numerous embedded URLs designed to redirect users to external sites. One of these URLs, 'https://yafferge.ru/123?utm_term=how+do+you+do+due+diligence+when+buying+a+business', is identified as a known malicious redirector. The presence of many links and the use of a redirector suggest an attempt to lure users to malicious content, likely for phishing or malware distribution.

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.
  • 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.
  • 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://yafferge.ru/123?utm_term=how+do+you+do+due+diligence+when+buying+a+business In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_5fda793784c1d.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/lenosofowureledusanexoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481552/normal_6017272db1ccd.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/when_salt_is_added_to_water_what_happens_to_the_freezing_point.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/dantes_inferno_game_review.pdfIn PDF document text
    • http://wordsidepost.top/ma2_color_picker_downloadsk5cb.pdfIn PDF document text
    • http://hookup671.site/giant_bird_of_paradise_plant_varietieski1s1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370541/normal_5fe03287ddcdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421944/normal_5ff97ffe47c1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454054/normal_60340144650df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_603131402f155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389387/normal_5fd9f29adf17e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_b325bf59a37c4c6fbcf48428742d74d7.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_1a1627964184404b940e5a855b1b792f.pdf?index=trueIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_ed85d77160754be98145119cdd329248.pdf?index=trueIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_c9d4efe2061d4b75b11cbda1285a3beb.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_b9cb4beb0b6646bfb26f75834e7811f9.pdf?index=trueIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_a7b1a1a545484902a682ac6247c13ad1.pdf?index=trueIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_ef24c7ec88d34aeaa91c84721b61ac99.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 5400 bytes
SHA-256: 652d1b32f547007f8b69de0f4ac8b2a82298dcf7daba8b8adf7596b38eb78082
font_01_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 9848 bytes
SHA-256: 924f59687e85336a9c39e7577c930d00e6efaa4fec8ed757ad70a7d14e618829