Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba49b2eb6ff0daa…

MALICIOUS

PDF

104.4 KB Created: 2021-03-30 05:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: dcf084b80269ddb7a7d82cce7ca9552e SHA-1: 20f03402c10700cbe375efbc201639167810438d SHA-256: cba49b2eb6ff0daaa373c81b3461515a93c3225aab8a15183ddb4a0d27e69364
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 attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. The document body, though truncated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create deceptive documents.

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://gimoguvi.ru/strik?utm_term=how+to+join+two+planks+of+wood+together PDF link annotation
    • http://lirinevewafa.mypressonline.com/how_to_open_paint_file_in.pdfIn PDF document text
    • http://dejamorije.scienceontheweb.net/56849666219.pdfIn PDF document text
    • https://lotuvimipel.weebly.com/uploads/1/3/0/7/130739731/pofodaboru-xazipunusesa.pdfIn PDF document text
    • http://igcopyrightverify.com/895267512040eppd.pdfIn PDF document text
    • https://cdn.sqhk.co/mojekuvugise/hdicQou/27770209042.pdfIn PDF document text
    • https://pavedivagew.weebly.com/uploads/1/3/4/4/134468388/8517162.pdfIn PDF document text
    • https://jijiluvupetopib.weebly.com/uploads/1/3/4/6/134644839/zaluruguliwa_kudamojaki_desonetapewaf_vokigiba.pdfIn PDF document text
    • https://cdn.sqhk.co/purijiralug/ohfGM4q/58753268983.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/giqjhzs/4543928258.pdfIn PDF document text
    • https://jakugogafezokev.weebly.com/uploads/1/3/1/4/131437362/278fcff735ac37a.pdfIn PDF document text
    • http://merokomazojewi.scienceontheweb.net/is_dark_souls_2_worth_buying_on_ps4.pdfIn PDF document text
    • http://istra-backwater.ru/27872951059a9xg0.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/fBY8RN8/virtual_families_3_cheats_money.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_880cde2df4e44769bac7886317c336a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mujesogi/13720974898.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/cookery_10_pretest_answers.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/lugowabi.pdfIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_b9de2e1d50a34599a0800c27ee8ee2fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dixaleko/apache_openoffice_4_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/delta_monitor_shower_faucet_repair_cartridge.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_off0001550f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1550F 5496 bytes
SHA-256: 2d965c6fe0aa332b921575a90edd14d59badfab921c405fe0aa79475f8bac162
font_01_sfnt_off000167d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167D1 12804 bytes
SHA-256: fe3a115d08e86879e0810a83ce263470aca559c12085610be2675ddda9c6175a

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