Malicious PDF — malware analysis report

Static analysis result for SHA-256 839ed01f4f3ce935…

MALICIOUS

PDF

92.8 KB Created: 2021-03-09 23:52:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7c94e6522e65c850717fa7ea2467b3c2 SHA-1: 91546b3e650a5f76355a5db2499c928d85e953bc SHA-256: 839ed01f4f3ce935624c381d67f57566430ff2ba7c3d38675e28d9494e83e071
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'crophysi.ru' as malicious. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and embedded links suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://crophysi.ru/award?keyword=como+funciona+un+aerogenerador+eolico+pdf In PDF document text
    • https://novatoful.weebly.com/uploads/1/3/0/9/130969934/wodonuvare.pdfIn PDF document text
    • https://bemisawu.weebly.com/uploads/1/3/4/7/134716701/53086.pdfIn PDF document text
    • http://sellamorem.com/nonefibadejuru28lic.pdfIn PDF document text
    • http://trastqort.online/string_explorer_violin_book_1a6x6m.pdfIn PDF document text
    • https://makonajarozov.weebly.com/uploads/1/3/4/3/134341931/tulevubamim_lipozoviroxap_nuxad.pdfIn PDF document text
    • http://xviiivbgz.com/dalukakunolotugpjp0q.pdfIn PDF document text
    • https://kotogafisix.weebly.com/uploads/1/3/0/7/130740127/tiduragi-mefulakojisot.pdfIn PDF document text
    • https://dudulisatosix.weebly.com/uploads/1/3/1/6/131637211/dowevifoloruban_jatotid_jobobi_xolaxo.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/fatisake/xoxinewezobewepenoxojabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed6775c-d508-4a8f-bc61-76da89cc0107/how_big_was_the_us_army_during_ww2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efb1b5ff-a24d-4a14-b3c0-2ebc27812ab6/3479297026.pdfIn PDF document text
    • http://tadoloko.epizy.com/is_meal_replacement_bad_for_your_health.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/vazux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f9d6045-4df1-43c4-bf58-489c683f52e5/probability_and_statistical_inference_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e62be6-904d-4eec-9bfe-b949872506fd/6704138157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d1778a-1e98-4713-843a-a051bc77fdbd/crossword_mysteries_episode_1_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/autocad_2017_commands_list_free.pdfIn PDF document text
    • http://fufezexu.epizy.com/damet.pdfIn PDF document text
    • http://welididoseburiv.epizy.com/58260618603.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/10984337360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d11809b5-d12b-4977-a66b-4680ab552bca/55699585152.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/adobe_flash_player_uninstaller_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b5ab6e-0246-4e5d-8713-f7c472a6d1f2/zosuzubexipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e039a0fe-8f53-424c-8359-b91a4b0a2855/82832385224.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_off00012b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0E 5204 bytes
SHA-256: 819a3db25de73d906c6dfa2b99b352f3b7ae01483f2d9306ad661c3eb67db306
font_01_sfnt_off00013cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAC 12032 bytes
SHA-256: 03a7bc652f9e16a4e813206c703f80a1210674c8ada4f0c50fc5959d13fe2b02

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