Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf799c4088c834e…

MALICIOUS

PDF

83.1 KB Created: 2021-03-08 13:24:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ef6d5ad8e13a5fbc6403462655862edf SHA-1: d1c8df1804fe2c11740f8191736aa08db1093b46 SHA-256: 3bf799c4088c834e41d7bf34c87f4f8f4f5c857c426c879ddd7c959c44baf7e6
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text that appears to be a lure, and the embedded links are likely intended to lead to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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/strik?utm_term=the+death+of+ivan+ilyich+and+other+stories In PDF document text
    • http://zatodawu.iblogger.org/the_veil_of_ignorance_definition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479214/normal_5ff8c6f114fe8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368495/normal_5ff6250661fb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_601c62a4d0b7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474978/normal_60334572c47a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419195/normal_5fe44a07aa218.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462344/normal_5ffd234baf35b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403823/normal_6039098969a92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_603401d8bbe42.pdfIn PDF document text
    • http://lovelatu.iblogger.org/definicion_de_salud_publica_segun_varios_autores.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387698/normal_5fd077f3656d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392463/normal_5fee8cf9e9e28.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dikawixum.epizy.com/ripabipuwonenitudowo.pdfIn PDF document text
    • http://pemukusa.epizy.com/powerpoint_gift_certificate_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/vizio_sb2920-c6_29-inch_2.0_channel_sound_bar_review.pdfIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_c523cd478790437d88e72daca38b27a1.pdf?index=trueIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_935d543cd3dc424ab5343e8d5c4dbb4f.pdf?index=trueIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_1f461e248cf540b7a22141be2afdb508.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/basara_ppsspp_google_drive.pdfIn PDF document text
    • http://verirajoxa.epizy.com/rujazinegukotuze.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_9ade1a6a6bcb4f38abef8e09c7d3066b.pdf?index=trueIn 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_off00010903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10903 5220 bytes
SHA-256: ac296d0a20f8ad553a0f63edfa476a5658083b28a0cafc4a71248efcc6984035
font_01_sfnt_off00011ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD0 10480 bytes
SHA-256: d10e3f34717bf9260db7033a0cb05f2990c5fd28973ec17d214f225e2adb648b