Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1f6311b3188a1f…

MALICIOUS

PDF

78.0 KB Created: 2021-02-25 07:31:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 19b6bc90ecbf5788ade77af5a63b68e8 SHA-1: 63beb76ea1e72e5ce488c0d16729f2a5750ea097 SHA-256: 3b1f6311b3188a1f5a118d94fc1c3a7718309832d4c5bc05fa98f49873514495
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting and known redirector infrastructure, suggesting it is used to distribute phishing content or malware. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct user-facing text that would indicate a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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=functional+training+exercises+for+older+adults In PDF document text
    • http://opit.space/9277177476637pfx.pdfIn PDF document text
    • http://luxshop21.site/hp_deskjet_3050a_compatible_ink_cartridgesnhkmi.pdfIn PDF document text
    • http://maturibcgj.space/what_is_the_general_composition_of_earths_oceanic_crustj4n6x.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwexosul/iighCjb/jorisosodagapuxinolovupil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381737/normal_5ffb1881a07a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385612/normal_5ffa67c3014be.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/55877907843pvdmj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_60251d55a2243.pdfIn PDF document text
    • http://itali-big.space/31743927410tn3a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485702/normal_600ea784e746b.pdfIn PDF document text
    • https://lexikusu.weebly.com/uploads/1/3/1/4/131438729/moxofuziruxagejajede.pdfIn PDF document text
    • http://pmaider.com/63231961413q57t8.pdfIn PDF document text
    • http://bt-management.website/marcy_weight_bench_set_replacement_partsep9r5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474456/normal_5ff7adb87eab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_602865b51bd23.pdfIn PDF document text
    • http://znakomstva69.space/fosixusamarev117j4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475376/normal_60372f7177fa5.pdfIn PDF document text
    • http://golosa-spasibo.ru/internationale_Telefonbcher_onlinej4pzs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://medlineplus.gov/exerciseforolderadults.htmlIn 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_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 5212 bytes
SHA-256: 56b4294a6be1b16f315af9678df109d009ee97adc05e4844679061adc82c9590
font_01_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 10348 bytes
SHA-256: b52868c37143314e8040d7efd177341ef58ca9af2cb96306a9497accbf93a94e

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