Malicious PDF — malware analysis report

Static analysis result for SHA-256 1076392b6b7757e2…

MALICIOUS

PDF

144.7 KB Created: 2021-03-23 20:30:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 10dc2bbab2f469919378920789e63c46 SHA-1: c59ac606da21b889d275663fe4b7a04e4cb9b19a SHA-256: 1076392b6b7757e244761fd2c53861fa720ad6bbfb8102fbf6ad74bc8d4fbff0
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://zajinet.ru/award?keyword=bach+bwv+565+pdf PDF link annotation
    • https://nelizebowi.weebly.com/uploads/1/3/4/7/134734992/688457.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/eiaiohi/fupemegin.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/oogfbhd/43374799287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413469/normal_602fca3d5a848.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/Piejchf/36072185310.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367312/normal_600934f7bf8fd.pdfIn PDF document text
    • https://lulezurikut.weebly.com/uploads/1/3/4/6/134667205/ruwitez-zewuma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492246/normal_601bb6b3c21df.pdfIn PDF document text
    • https://lokuzovitopoz.weebly.com/uploads/1/3/4/8/134871506/46259be5d7cfe.pdfIn PDF document text
    • https://gudabujazoz.weebly.com/uploads/1/3/0/7/130739385/961341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447460/normal_6044cd5e3e96b.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/lk1hebM/olympics_2016_basketball_roster.pdfIn PDF document text
    • https://cdn.sqhk.co/vekazedivipi/hhgdicV/vuwijadorafabiwezuk.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/1c87ce60-c541-45eb-99d1-a82c4be7e664/gobiwo.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_b1a5b1a0122a47598ef95913e1c24f8b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8366245c-7046-47c5-ba14-851a34bf1469/47737821969.pdfIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_2844cf6b324d470c9340de705b334e17.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a729553-0b49-4537-8cfb-0e68f100e02c/what_age_group_is_twilight_for.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_89c7c21458f84fb5814b945eb953be24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36bd350a-6f02-49d5-ab81-65cfef82c3cb/roxubek.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_92340f4d36e343ddbf96c498d48f4516.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a12a1f-0b5b-4f5e-ac4c-2d5976c33f35/how_many_carbs_in_taco_bell_nachos_supreme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ecb2c2-89f3-45d9-845b-66238a147757/argumentative_essay_first_paragraph_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f981a5a-79db-42b3-8836-4e32318158c2/smith_and_wesson_915_holster.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3F5 5556 bytes
SHA-256: a84d7eb5ed5432711537473f6aa9cfe35391ec8c7bbd03cabc09528b493b47da
font_01_sfnt_off0001f6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6FA 12848 bytes
SHA-256: 5d558cfad91ff42146af927a3774ad6840b6b0bdfad2aa5a72e6c11443192d17
font_02_sfnt_off000220f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x220F1 16120 bytes
SHA-256: 2cfc97915d250804213c9b0e6ad261e0979cd38371fb36ec9174dea58a153a3e