Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c710e9c5f4ae77…

MALICIOUS

PDF

82.3 KB Created: 2021-04-14 10:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39d7fc53033668f09253a3ad6437ecf5 SHA-1: d3e5edf4c23830be882e33bd9c47a59a26d7bde7 SHA-256: 33c710e9c5f4ae7713c4370699f494f681f0497be15069daecdc09551ceece8a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains associated with link farms or potentially malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=stock+market+for+beginners+philippines+pdf
    • http://wumewil.sportsontheweb.net/how_to_calculate_area_for_different_shapes.pdf
    • https://damemebu.weebly.com/uploads/1/3/5/3/135316778/4833966.pdf
    • https://pevidutapare.weebly.com/uploads/1/3/0/7/130740538/kurezidovoj.pdf
    • https://jowatoziji.weebly.com/uploads/1/3/4/8/134893097/f72c8201f37c22.pdf
    • https://zigaxedalinuj.weebly.com/uploads/1/3/4/0/134016671/tofidi_nowikafozomiker_fixiwusamote_musuwutedasi.pdf
    • https://bunutawopuzo.weebly.com/uploads/1/3/4/8/134868528/jovefiropeninosejude.pdf
    • https://vogitoroxubas.weebly.com/uploads/1/3/0/7/130739894/kepidoben-lomegedokivip-kiwop-xusog.pdf
    • https://jepololazatozuj.weebly.com/uploads/1/3/4/6/134601538/63349d570c.pdf
    • http://revodegasiger.sportsontheweb.net/2765444239.pdf
    • https://wutadesojijemez.weebly.com/uploads/1/3/4/3/134393937/3f69420fb9c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5986d403-3b67-403c-bf8c-3d985b30ff37/art_pro_mpa_ii_tube_upgrade.pdf
    • https://uploads.strikinglycdn.com/files/f3ab20eb-c96a-4f43-9ef3-1eb8ed48a74f/76859304473.pdf
    • https://uploads.strikinglycdn.com/files/c8cb26fe-08e3-46c8-bccc-267e52aeb5e9/ninja_blender_1000_cups.pdf
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_343e3b89161f455b80e93ab49ab47a62.pdf?index=true
    • https://uploads.strikinglycdn.com/files/08ab3fe1-0ef8-4ad5-a97a-5ac1fe4cdf6b/five_dialogues_plato_sparknotes.pdf
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_e2a52c1bbe164e8a8850f03caff78d33.pdf?index=true
    • https://uploads.strikinglycdn.com/files/400d34d5-7c5c-4376-b78f-2773f3c90aa4/98468120976.pdf
    • https://uploads.strikinglycdn.com/files/11c6c7bd-ba2f-43b3-a0cc-da7622332f5f/relikutab.pdf
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_7e527b1b9f4c477084d80f7ab92b2469.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fb9191a6-53eb-4572-8bc0-f47e15056fa4/what_is_the_empirical_formula_linking_mean_median_and_mode.pdf
    • https://uploads.strikinglycdn.com/files/258107c5-4ff5-441d-a174-ca776c04951b/18455428840.pdf
    • https://151dec52-cf20-477b-a401-a68195eead79.filesusr.com/ugd/8538f4_8d95e546d5324a44ba491e1ae1159f0d.pdf?index=true
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_fefa17c8262a4670905c87ca57f2b29d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a4f1eeb9-6e1a-416b-afaa-3d3602bf5aea/the_complete_maus_summary.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100ec.bin
6514cefdc7b07467f3d3024f3d08b541d771bc540aaabb9a5968f9bd469505d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100EC 5876 bytes
font_01_sfnt_off000114c2.bin
c0f05bb42c3b92723dda7381616bcce9aceec8ab84895c537735e91184196e45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114C2 11304 bytes

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