Malicious PDF — malware analysis report

Static analysis result for SHA-256 082849adc535b23f…

MALICIOUS

PDF

71.7 KB Created: 2021-05-17 02:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e87a6f861ff09246f4f1b40731e6d786 SHA-1: a9afc7b74c1a59879d66953aa00f192492008c23 SHA-256: 082849adc535b23fbce5aa339c7a6816af1238a7c87102847da8f36a469c51a4
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of numerous links on disposable hosting further supports a phishing or malware distribution attempt.

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/strik?utm_term=does+covid+cause+high+blood+pressure+after+recovery In PDF document text
    • https://cdn.sqhk.co/bivuwusim/jhihsY6/converting_customary_units_worksheet_6th_grade.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/dobejexubapitiyscri.pdfIn PDF document text
    • http://busivel.xyz/83587433999le21j.pdfIn PDF document text
    • http://igafnd.org/8940612939ho1t7.pdfIn PDF document text
    • https://cdn.sqhk.co/mezugifosa/f5gjgdl/1830953493.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/WigNDia/46090150978.pdfIn PDF document text
    • http://alcexpress3.xyz/kijowufakeziwarodl3.pdfIn PDF document text
    • http://mavpa.fun/rt-ac68u_reboot_schedulet0ua4.pdfIn PDF document text
    • http://instasurprise.online/sao_swordland_mp3_downloadrcjts.pdfIn PDF document text
    • http://sallehq.xyz/wexifikodexetubepazinoqyn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ec3e06-c7be-4de8-8b78-a44a744f4cdc/bose_sounddock_iii_bluetooth_adapter.pdfIn PDF document text
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_00aacef68de14ed6a9d9c480d51fc59f.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_8b6327c31ff74c46a3072605a238592d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1577607-ea13-4940-a108-81ad7e887464/what_causes_denervation_hypersensitivity.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/33477140086.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/subject_pronoun_worksheets_6th_grade.pdfIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_bbeb6d410b5e4b72b4049a9503e94ca8.pdf?index=trueIn PDF document text
    • https://5613ab86-cfe5-4642-b9e1-29ab5e510d76.filesusr.com/ugd/79e000_b36864fdb40e448abbe99c9cce1d60e0.pdf?index=trueIn PDF document text
    • https://245ae9ba-e923-43ed-bc11-30ed5d1acd78.filesusr.com/ugd/051519_7cb83cb3b7b348119ef21d68409d2275.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_off0000daf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF1 5716 bytes
SHA-256: d1b9359839d850e09b6b75fc9348a478b3b8b5507db34ef978e1b041957fd8f6
font_01_sfnt_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 10252 bytes
SHA-256: f34aaab477b93c958bd97ee4dd7f6a24e7d7876550314569cf73ce01f3640c7b

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