Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c855a3549bad256…

MALICIOUS

PDF

73.0 KB Created: 2021-03-20 01:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2c4af498255ce52234e65c68a28ad87f SHA-1: 58556b429feea44f91230bda8af8939d46d1d652 SHA-256: 7c855a3549bad256448226d6645962999e900238c2db8dfa130ab106fae1a722
252 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=i+could+pee+on+this+pdf In PDF document text
    • http://pocki.top/55102289440x3d6.pdfIn PDF document text
    • http://dress-russia.ru/what_does_psalm_23_verse_3_meanywx1g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://patuwovoparivi.rf.gd/ariens_parts.pdfIn PDF document text
    • http://zewukiro.epizy.com/batting_average_excel_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/679f1887-3159-4454-9888-2cce51589dd6/how_to_become_real_estate_agent_in_mumbai.pdfIn PDF document text
    • http://solodiwamu.rf.gd/titakoluvigitirutasazov.pdfIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_c2e89df591234bc4aee0bdbc21b3175f.pdf?index=trueIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_fb284bcb4489438fbec23741fa0044e6.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_4f767e54b02140c0948cf5955ce4fa4d.pdf?index=trueIn PDF document text
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_1769e7d71d024c72b483ee9ee066e9d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b32cb126-f341-4842-b7d5-45d3dd2a735e/80627234605.pdfIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_7c8eef21f63149bdbc5ec8f57a63770c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9fe7e2d-beb3-499b-8506-76cb230d6f5e/mn_drivers_license_status_class_a.pdfIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_1b0bdd2cbbdc4db9b03536fede77a566.pdf?index=trueIn PDF document text
    • http://jofawapedoguw.rf.gd/teseso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f907550-4d7e-46bc-bc2d-54c31ef5fb53/74389632194.pdfIn PDF document text
    • http://fumilojejukuro.rf.gd/kreg_pocket_screw_length_guide.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_c2b14d548d0740c78ad60ca69bc04d9c.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_off0000e10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 4872 bytes
SHA-256: 42549adb9ea8f4da819c4fc4f234c04f1870c0b9f992e6aa39d5d1650019b8cf
font_01_sfnt_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 10952 bytes
SHA-256: 7bb643962b1b63a1654b3a6df13d76889cfe63b6d5f109fd72a6010c4b115123