Malicious PDF — malware analysis report

Static analysis result for SHA-256 4984e19eef3a6253…

MALICIOUS

PDF

76.4 KB Created: 2021-05-11 08:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 60ca92cbfd2ca5c63daa5af86aef46ba SHA-1: d4c03cb3565570db0473a560085104fe554939aa SHA-256: 4984e19eef3a625381e2b57bfa83745e0099a9d0b19d618f38cc735ec651782a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://bologen.ru/strik?utm_term=yamaha+htr+5730+specs PDF link annotation
    • http://all-system7.work/jidasutoj2nhq7.pdfIn PDF document text
    • http://sorewoforami.22web.org/fikotexokukipuzagi.pdfIn PDF document text
    • http://strongcreditscore.info/salexopafe956mb.pdfIn PDF document text
    • https://ramasiwo.weebly.com/uploads/1/3/5/3/135390431/c0686899837e9a.pdfIn PDF document text
    • https://kolagigeb.weebly.com/uploads/1/3/2/7/132741023/2433322.pdfIn PDF document text
    • https://zizopozuwugova.weebly.com/uploads/1/3/0/7/130775786/zarukemo_renamaza_zedexaxerad_rafalekap.pdfIn PDF document text
    • http://befemoxujutebi.22web.org/warcraft_3_reforged_beta_reddit.pdfIn PDF document text
    • http://steelsho1.club/what_foods_cook_well_in_an_air_fryerr4poq.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/wawosuri.pdfIn PDF document text
    • http://vakafubetax.iblogger.org/dream_of_a_spider_in_my_hair.pdfIn PDF document text
    • https://sefariduzaki.weebly.com/uploads/1/3/4/6/134665623/f954d09fe8b.pdfIn PDF document text
    • https://papuwupiruji.weebly.com/uploads/1/3/4/3/134348025/tijoxom-ritunig-zeximupojor.pdfIn PDF document text
    • https://sunuzokelegawo.weebly.com/uploads/1/3/4/4/134476032/6500938.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/f24795ff04c40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/atlanta_marta_map.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/90296268159.pdfIn PDF document text
    • http://rekekolulopar.rf.gd/best_free_audiobooks_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/xosemogibagoma.pdfIn PDF document text
    • http://judutuv.epizy.com/taxizasefigagoluz.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/call_of_duty_wwii_ps4_digital.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_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 5612 bytes
SHA-256: 38adbe8bf49ba5d9328ac2d99093cc846d01d5b4f77d40cbb6eefd64579d7f63
font_01_sfnt_off0000fe91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 11196 bytes
SHA-256: b40bb64ac167c3f90347b43c8b729581c06c75842eaf20440275be604f92e2a6

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