Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c8600c5f08cf4a…

MALICIOUS

PDF

99.8 KB Created: 2021-04-05 17:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3cc9dafab45bf79c4121cbc4db43faf1 SHA-1: d3bad0dd10fb14a0029127c630dc0ffef82d9be8 SHA-256: a7c8600c5f08cf4ac5fea45dabe37e19509d585a0ec615525f9bd6f4e94a6e23
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The presence of external URIs and the overall structure strongly indicate an attempt to redirect users to potentially malicious content or manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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://soxebez.ru/award?keyword=queering+anarchism+pdf PDF link annotation
    • http://spain50off.info/birdy_wild_horses_piano_sheet_musicgdixy.pdfIn PDF document text
    • https://xoniruzi.weebly.com/uploads/1/3/4/8/134869292/28b0675bd.pdfIn PDF document text
    • http://hushseo.online/vajaxisarivevifgku7k.pdfIn PDF document text
    • http://jusapp.club/graph_isomorphism_problem0w67l.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/strong_fathers_strong_daughters_by_meg_meekerusduw.pdfIn PDF document text
    • http://kinorio5.xyz/sekiro_feeding_attendantbf1ix.pdfIn PDF document text
    • http://irbestate.ru/mercruiser_3.0_enginee968u.pdfIn PDF document text
    • http://tixshopclub.space/average_cost_to_replace_oven_igniterujf53.pdfIn PDF document text
    • https://vulemozebo.weebly.com/uploads/1/3/4/6/134693025/sunetepipo-wuvetebovukalin-lopad.pdfIn PDF document text
    • http://salimom.mygamesonline.org/el_sonido_y_sus_cualidades.pdfIn PDF document text
    • https://regifedemez.weebly.com/uploads/1/3/1/4/131406591/1234d2f.pdfIn PDF document text
    • http://kiparegazeratax.getenjoyment.net/brady_bmp21_plus_manual_espaol.pdfIn PDF document text
    • https://maraliva.weebly.com/uploads/1/3/2/7/132712127/ganaxa_lobomo.pdfIn PDF document text
    • https://ratipixudaxixix.weebly.com/uploads/1/3/4/4/134472160/9a8dfcc18d2b46.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/c7de3dae-f1de-408d-91e2-84166047da50/54072902683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28bd9137-d086-487a-8c1b-10035c8c2f9d/what_does_once_more_to_the_lake_say_about_identity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2bbadc6-2a32-482d-8536-080d02ae814a/coleman_roadtrip_285_grill_water_pan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a73bb355-18d8-4e00-ba89-b52bec265e8a/how_to_reset_alcatel_phone_without_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e71bdd99-b0dd-46b2-8d4b-4e56a0f5d798/zofiwuxazibizuwovuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60708254-fd92-490d-8880-33aae27470f7/how_to_start_a_critical_reflection_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6e7d177-4a49-456f-866c-8edfe8f0e57b/46352319192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3982257-0cce-4bd0-85ec-13393f20af16/kenibunovuzofejalokute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8577653-5f39-4c16-af22-06813c96d972/kodufuwamaforaga.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_off000144ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AB 5600 bytes
SHA-256: bb612ce86ba62f15077a33346e4573a623abe5eb09a57eb005ef61b9d86a6474
font_01_sfnt_off00015789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15789 13552 bytes
SHA-256: 4a89655f0f63c7045b602eb48e1b44400b5b1d1491a2eb3d2d1336b5ae993bff