Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec0ddcf2b978258…

MALICIOUS

PDF

84.7 KB Created: 2021-04-27 20:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b9f2e7b11fdc10088123abcfad7eea6e SHA-1: 56d7d87d88fd4f6ecc52dffae5f732c09bdc1cd7 SHA-256: 4ec0ddcf2b978258c0edc710c73045770d60e188051d7605ba29037b70f6ee9a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards the use of JavaScript for malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=2005+dodge+grand+caravan+sxt+alternator PDF link annotation
    • https://disabamabasato.weebly.com/uploads/1/3/1/0/131070072/misufezejutiwox-gatavuxabafow-wipija.pdfIn PDF document text
    • https://cdn.sqhk.co/bejadelu/jjLeCfF/81356187541.pdfIn PDF document text
    • http://mestikon.online/does_dunkin_donuts_still_have_munchkinsssaye.pdfIn PDF document text
    • https://cdn.sqhk.co/fatobaliv/guT8gdA/free_horror_ringtones.pdfIn PDF document text
    • https://dagepafu.weebly.com/uploads/1/3/2/7/132740813/dca51d.pdfIn PDF document text
    • https://feziriwavejoli.weebly.com/uploads/1/3/4/0/134096108/waxazepun.pdfIn PDF document text
    • https://zekenegelu.weebly.com/uploads/1/3/4/3/134390475/zibururajekomu.pdfIn PDF document text
    • https://balolemarivapi.weebly.com/uploads/1/3/5/3/135309218/6123380.pdfIn PDF document text
    • http://filemarker.store/94507612754tzff1.pdfIn PDF document text
    • http://eglo.club/ielts_listening_book_4_test_2_answersgs7dx.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/sojijumubx8o4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zagubip/23573851608.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/vijekenu.pdfIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_76b6730569714daaa1644360e931487f.pdf?index=trueIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_4cfc1180938c4310a739ab455ce5a39d.pdf?index=trueIn PDF document text
    • https://e37fb4d6-fac4-4cb1-96d9-cce2dae532e5.filesusr.com/ugd/ed2751_0355d782043d480a93f0b85c19deb963.pdf?index=trueIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_7fe66ffa9c3b46a19de01eae059d57f5.pdf?index=trueIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_c6fee86f513c45b58a78c2e5a847af7c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/cara_sertifikat_akreditasi_ban_pt_ugm.pdfIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_1f70b3db03534d1c99d6d6fde43ca3d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/kumexizisewenutivegifime.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBE 5536 bytes
SHA-256: 75cb5125cfe0701bd13c7798cbc3243499ffa3093c5ecdb8e100beef05c1a4c7
font_01_sfnt_off00011fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAE 11020 bytes
SHA-256: f04812e1e7c8b048189c5fc8575c33d3c476348b3a21be9730dd38f12d8349f0