Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e2a1e56e73c5d4…

MALICIOUS

PDF

94.7 KB Created: 2021-03-10 04:48:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6d27938f72c72c93813ac560b14c0577 SHA-1: 78de71a7a21855f56ebd7bf426f7fff984d52901 SHA-256: 57e2a1e56e73c5d45f0d8df6a024ebacb877cee19e525028eb3b3a64476d708f
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 pointing to disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://dugedepap.ru/strik?utm_term=breadman+bread+machine+recipes+banana+bread PDF link annotation
    • http://myfirstsite.xyz/45185856442xscos.pdfIn PDF document text
    • http://uanews.website/soleus_ac_8000_btu_saddle_window_air_conditioner3cf4o.pdfIn PDF document text
    • https://cdn.sqhk.co/lelabepena/WB7hiBc/xetonobedomed.pdfIn PDF document text
    • https://cdn.sqhk.co/kowalaxu/7vVP5jd/pac_man_coloring_sheets.pdfIn PDF document text
    • https://cdn.sqhk.co/perigupa/ew4gchd/mysql_server_port_already_in_use.pdfIn PDF document text
    • http://8gusevshop.website/how_to_connect_plantronics_headset_to_phone0zker.pdfIn PDF document text
    • http://sallehub.xyz/42787362323d3zlc.pdfIn PDF document text
    • https://cdn.sqhk.co/wefopijupe/ejebrgi/xomamukarojataguti.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/DieqgfP/52045644561.pdfIn PDF document text
    • https://cdn.sqhk.co/fexejikexew/gdidjaY/detectives_united_timeless_voyage.pdfIn PDF document text
    • https://cdn.sqhk.co/nigalasiline/ijjgeid/29362972863.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_7df92333ace2496bb1bbbe9f80c3435d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/free_printable_dichotomous_key_worksheet.pdfIn PDF document text
    • https://54a0e2cb-796f-4f80-9aaf-d11633176b06.filesusr.com/ugd/b0c554_82727d1693c841969df08eb354e8e7da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/13825627680.pdfIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_82bb9b2bac0049389ff75de0275cb203.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/had_to_exercises_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/79284117170.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_off000135d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D2 5468 bytes
SHA-256: 849a272f3cf25ced52b7d066bd257f50d8af418246b264c172deec90d66b172b
font_01_sfnt_off00014835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14835 10972 bytes
SHA-256: ababa8d13321b06aac6a5b42cc7b984d06c7140a23554c1bee8786c2fc482267

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