Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f73aba0b66c137…

MALICIOUS

PDF

71.6 KB Created: 2021-04-01 03:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06f5279f9042c3332375ae8a8650499c SHA-1: 3cb2e2078bd2df65c6eb616319568185896731a0 SHA-256: 20f73aba0b66c1376e20046b24277a5377c41b7548e893964ee842db711ecfef
194 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 hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The embedded URLs and the ClamAV detection indicate a phishing or malicious redirection attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://baarspo.ru/award?keyword=alice+in+chains+dirt+tab+book+pdf PDF link annotation
    • http://gelixovuxa.22web.org/86758446396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_602e2aa94069d.pdfIn PDF document text
    • http://levantegroup.net/cast_shadow._psdqicyk.pdfIn PDF document text
    • http://boost-store.net/mama_bear_legal_formsr6f1y.pdfIn PDF document text
    • http://mebelrostov.ru/cavaliere_range_hood_not_workingilmwd.pdfIn PDF document text
    • http://apparently-home.com/ap_us_history_chapter_19_quizletwsab6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394077/normal_60533a932302e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c8ff5639-09d9-4535-8c68-e7569a30476d.filesusr.com/ugd/0bcf16_f94ab5bec6f24e6395c9680d01f2445f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/696c983f-b8b5-4a06-97be-9015f5e85dd2/vawevexasekumafijapaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ddc9cf-3339-4020-a757-3a707bdcca6b/jakozuwevajibudita.pdfIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_928a2f4382d74bfdaa272435b8fcee8f.pdf?index=trueIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_e71e310b39044d7b9499370e26a64ba4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd68bd0d-fc44-45e9-9e64-c563df8f7420/quem_paga_imposto_de_renda_recebe_restituio.pdfIn PDF document text
    • http://wekidezeze.epizy.com/military_phonetic_alphabet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e4a6afd-0e3d-4128-8162-ef4a6433f629/nodesubabuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f50efcb0-03d3-48db-ab0b-64aff15498b6/starting_your_own_clothing_line_online.pdfIn PDF document text
    • http://banadefugavolar.epizy.com/how_to_set_up_jabra_elite_75t.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa309fd-fe52-44b6-8087-c1cd61bee277/jiperujunosanes.pdfIn PDF document text
    • http://xotomupifejiref.epizy.com/ballroom_dance_step_diagrams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f5c5922-0daf-416d-8b76-0a4355350f4d/what_countries_are_in_world_zone_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/769a9924-9a44-4887-b142-0ce6e0c741e4/how_are_living_organisms_classified_into_different_kingdoms.pdfIn PDF document text
    • http://wawebepibalura.epizy.com/86544775522.pdfIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_98bd8b11bec9478eafc28a3febe68ade.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eaa6076-eb3c-49b4-a2e4-7df4db4bd209/notogubapirekuzoponexexeb.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_off0000d936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD936 5436 bytes
SHA-256: f300d17b817fa7fd2cc6e8a523588a83f6430806ee9e3d0be94105131cea6343
font_01_sfnt_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 11056 bytes
SHA-256: dfec45b2ff900d29e18181c6843fc0d64a2ed55ab878c665c7dc10d53e4e4e93