Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd54f8b4ce38565…

MALICIOUS

PDF

99.7 KB Created: 2021-03-23 03:25:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5bb5fa5b0944640034568ddea30affb4 SHA-1: eda7ce5fad7df63645698dcdd4ed8daf500644af SHA-256: ddd54f8b4ce385658be92943afac7a80a97763a656569113dfc281ac03223c46
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting or potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary malicious URL identified is https://soxebez.ru/strik, which is likely used to redirect users to a phishing or malware-hosting site.

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://soxebez.ru/strik?utm_term=biochemistry+jeremy+berg+8th+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379483/normal_60319646a766d.pdfIn PDF document text
    • http://xumegexujarev.22web.org/game_crash_bandicoot_ps2_untuk_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469374/normal_602f7a82ac559.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424376/normal_5ff0c5f27f242.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/8f50db80-752d-4872-84c6-c3e9532b8aa7/metatex.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/free_printable_clock_faces_for_telling_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc8359a4-9adc-4881-b6cf-339874451225/crossfit_exercises_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa67f91-ad76-404d-9add-5c8965654373/how_do_you_type_the_beta_symbol.pdfIn PDF document text
    • http://vaduxovogemuke.epizy.com/djiny_eck_literatury_luciano_canfora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7497dfd4-3575-4857-b29e-1f7aa0e236cd/how_to_become_a_good_christian_man.pdfIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_d8de5a2c21334543a0020cc8f45a7ed1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91d80ed8-1d04-4947-9242-63bc9eb35dca/john_deere_950_tractor_review.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/human_sectional_anatomy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/026586f7-0c7f-4aef-aa88-8ad37f44973d/wekinutifejenirelo.pdfIn PDF document text
    • http://xesidif.epizy.com/jafebifevuduri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/135d854f-dba2-42d8-acd5-4e2285a0c395/dunkin_donuts_ham_egg_and_cheese_croissant_nutrition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1a30f03-088e-448b-a478-ba61e8621f84/juzevulurivatefibe.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_060d7d1333194999bcafc7ab9a399346.pdf?index=trueIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_a2da93d0efaf41f0ab4bb74a79052b18.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5886c5e8-bc47-4be7-add8-eda90329fcdd/quais_os_tipos_de_sistemas_economicos_existentes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 26596 bytes
SHA-256: d2842b26b63c2a50b5733c296bdbd32633e042d9817991e673df4ce43fed8a81
font_01_sfnt_off00014751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14751 5672 bytes
SHA-256: 1c6e111872717200ea9dbd596ebd9ccec12472f23e8eab09fbf1d028b2a5d365
font_02_sfnt_off00015a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A83 11624 bytes
SHA-256: 66f20480a152230a4aaa84029c760820002a72f60ffc1f23774c232bef6034a7

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