Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf73fa2438e38c89…

MALICIOUS

PDF

82.5 KB Created: 2021-03-24 23:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1465b7f5c39b1bf4ceef18bfbc674eca SHA-1: 41248093b9fba3a849cd4f27a394f0806f73ff81 SHA-256: cf73fa2438e38c89d42b0fa9c930c5b1fc2007995879e5ec9638417e11d1f571
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to an English exercise, which is a common tactic for phishing or malware delivery.

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 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://static.s123-cdn-static.com/uploads/4383572/normal_5fe25c122b152.pdf In PDF document text
    • http://kozlo.space/kakebatimamlri8.pdfIn PDF document text
    • https://vumokaxizojomij.weebly.com/uploads/1/3/2/6/132680848/wifenezoxe.pdfIn PDF document text
    • http://ita-talia.fun/lost_at_sea_movies_on_hulumhk6g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404500/normal_6041a4a39828b.pdfIn PDF document text
    • https://sasujenag.weebly.com/uploads/1/3/5/3/135337218/826160c7.pdfIn PDF document text
    • http://tonerinkstore.com/zuzerobuxawilomotilomu85z1m.pdfIn PDF document text
    • http://ideal-it.fun/panchatantra_story_in_sanskrit_with_moral6u22s.pdfIn PDF document text
    • https://rivezotuxo.weebly.com/uploads/1/3/5/3/135337491/4207847.pdfIn PDF document text
    • https://sozazajigosana.weebly.com/uploads/1/3/0/7/130739782/8676039.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/mawanivemekiwezujomodo.pdfIn PDF document text
    • http://sodahub.pro/demesuwirozalunosufajejy04lu.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://feedproxy.google.com/~r/wb/ENAH/~3/4NO0L8wlyOA/wb?keyword=comparatif%20superlatif%20anglais%20exercicePDF link annotation
    • https://uploads.strikinglycdn.com/files/84b1cf5f-c1b9-4999-8b17-d4fcef81cff6/is_the_movie_the_coldest_game_true.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/498ecd63-a287-46dd-9a9c-e26f6b6cd3e6/wanosaxiveximos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a27e9b43-2c10-4455-83f0-bc0be5de91ef/siwuxulenudulejusilapejor.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/anorexie_du_nourrisson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ce0e9fa-ea57-4972-b599-d52927169078/zewebuwosekopamof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c946bfd-2ed0-4bc6-87e5-78b80ed74ca2/how_to_find_song_by_sound.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_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 5308 bytes
SHA-256: b9163d61fab366d57299f618ed0c19fd71fba4d7f8076104ec8c21e027708dd1
font_01_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 12516 bytes
SHA-256: 2bb4e8c06f9f17e07080d3dbd8cfc2c29321fa3cb94c742739c67dddb34a5372
font_02_sfnt_off00012e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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