Malicious PDF — malware analysis report

Static analysis result for SHA-256 d357b7327ce5d367…

MALICIOUS

PDF

83.7 KB Created: 2021-03-24 00:09:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 03432fe2ac14e634026732de31b4935d SHA-1: bcbd6bb046657374ceff0b1eda54ba08e8170ce5 SHA-256: d357b7327ce5d36761ebf9bb1f4a791f5c076445d447f509548a0a30f99f4168
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains, indicative of a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the document's structure suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/wix?keyword=looking+for+alaska+pdf+reddit PDF link annotation
    • https://cdn.sqhk.co/jivobukafon/ahjiida/kofuduginekor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460070/normal_601582144e9ac.pdfIn PDF document text
    • https://cdn.sqhk.co/pofakedajavo/jhYBhhE/tipusifawe.pdfIn PDF document text
    • http://kifepivukog.iblogger.org/chammak_challo_song_mp4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386822/normal_60010500413e9.pdfIn PDF document text
    • https://cdn.sqhk.co/desixurate/dxjh4ct/salexulapanubujuku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457000/normal_5ff9aa00aaaa2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c61d3bac-26a0-4c75-b0a5-e00349bac852/nosudebafogekexibilej.pdfIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_a39184f9922842dfaa0664c00dac2bfe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/142d0759-585f-4bfb-9752-cc88a3336d14/after_we_collided_netflix_release_date_south_africa.pdfIn PDF document text
    • http://lidufaz.epizy.com/matrices_worksheet_with_answers_doc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc74d1d5-fe97-4ce9-95ff-ca5181d25124/nakogajozesumiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/667d12f6-5d1c-4295-958b-ffdf8321fe92/how_to_get_better_at_fantasy_basketball.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f37d67b3-c885-4502-9f34-4f5483edadeb/formula_de_acido_clorhidrico__hidroxido_de_sodio.pdfIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_a7c4be1e1791467faf82f9c5de51a518.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede5f06e-e228-4672-9796-9077cef57d9a/business_english_words_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c5eeee5-f46d-465f-bd12-a62597fd9217/how_to_go_from_factored_form_to_standard_form.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 5000 bytes
SHA-256: a18a2c1ae4f6df165041a59bb49529b85a1a6e2aa0baee486891e87df3763171
font_01_sfnt_off00010a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 11468 bytes
SHA-256: e6b879e582ef950cda5196fc5b798612b160dd2311d67233d7e478b138d74265
font_02_sfnt_off0001317a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e