Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c705794e4adbc80…

MALICIOUS

PDF

70.6 KB Created: 2021-03-14 09:34:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5328ac4259e71fd1fb3729b0d8cf1b4c SHA-1: b113624da9625e4258e3d296297317e164da0d5b SHA-256: 3c705794e4adbc8070a46c21206a459fc28a6166ac702c43fee16f49c8cfdebe
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are associated with SEO link farms, suggesting a malicious intent to distribute spam or malware. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the PDF structure point towards a phishing or malware distribution attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://gimoguvi.ru/strik?utm_term=chamberlain+garage+door+opener+remote+programming+keypad PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367911/normal_5fc9abee6c7fe.pdfIn PDF document text
    • http://tizezs.xyz/docker_commands_windows9kqfc.pdfIn PDF document text
    • http://flowerport.market/wonder_study_questionsnd2gk.pdfIn PDF document text
    • http://repair-monokoles.ru/how_to_learn_english_classes_near_mee36ct.pdfIn PDF document text
    • http://8bitbeardsco.com/462175318377x90w.pdfIn PDF document text
    • http://vbruti.site/real_bike_race_2019_game3vsq6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464865/normal_5fe540f1bad9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378153/normal_5feb9d3c9e4d7.pdfIn PDF document text
    • http://legalvictory.group/fatuvimafazosokakogubxxqg.pdfIn PDF document text
    • http://womenita.fun/battle_of_vicksburg_3_apk_modlixq4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479917/normal_5fdef08bd541e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467278/normal_5fe164831ab90.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/0ac5eb04-86b6-4379-bac2-fac145006f72/68355204043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74ad070c-6aa0-4ea6-b50f-2e2e25ee6162/nomedobodapijepufokafufu.pdfIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_e05627d1c5394341ab1bb5f9eafeedb9.pdf?index=trueIn PDF document text
    • https://1e6856c5-1481-42a3-8d1a-2a2567f9fa5a.filesusr.com/ugd/a8b033_d81d59063ac349b592273efa673fd1bd.pdf?index=trueIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_5f5f1c53c021487ba4f4a775328b80d4.pdf?index=trueIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_31e74639f03d4e64947dbff968347bfb.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_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 5408 bytes
SHA-256: 0df5c2d1709ea944dacfba56c07ecffd8ba3b8b872bb9d4643e90e67639ebd0c
font_01_sfnt_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 10052 bytes
SHA-256: 731c208ffc16510a30a2a4f8e7a1b1da6ea12cacec82ec0c90e14cfb8c559898

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