Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad62d3551e32dd2…

MALICIOUS

PDF

77.5 KB Created: 2021-03-20 05:29:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f923d5de496c4be796f1ab4f1bb2ac7c SHA-1: 63c0349846ddebc99425560fbc2620c79b95de10 SHA-256: 0ad62d3551e32dd2484795e28974883b240b3b84bb633e24ce1ae4c7f4bde700
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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
  • 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://lozipotod.ru/123?utm_term=field+placement+report+sample
    • http://idealica-italiaufficiale.site/subawowxxayf.pdf
    • https://simebusuf.weebly.com/uploads/1/3/1/4/131406507/pejeme.pdf
    • http://eushopvmn.site/logaxowufirapikolub0rh.pdf
    • https://jibisovewa.weebly.com/uploads/1/3/4/6/134653871/zokufodat_wetogalo.pdf
    • https://nutuneronasida.weebly.com/uploads/1/3/4/2/134266022/2544974.pdf
    • http://bratskpravojur.ru/metodologia_de_la_investigacion_5ta_edicion_hernandez_sampieri8ptw9.pdf
    • https://powufekati.weebly.com/uploads/1/3/4/0/134012492/gemimajir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_eb6bc9691785483ba4d1c7db50c5b8d2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0c1b48cb-0f9f-4494-92f0-605576820599/boyfriend_application_funny.pdf
    • https://s3.amazonaws.com/lomogas/vezevufuzibotatenudog.pdf
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_ef67955759ca4f109e1ad94dd63876da.pdf?index=true
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_287f8853915a4368affff26e86db554a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ac871204-a546-4395-893b-c2a4bab82e0a/marantz_professional_pmd-300cp_specs.pdf
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_f486a9f1073543e4bba55d8972009e86.pdf?index=true
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_9c966b26f9624d5c9522af1febfb779b.pdf?index=true
    • https://s3.amazonaws.com/vifusupegiza/bilaspur_university_private_exam_form_2019.pdf
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_19de2765e1084f208cd3f5c28f6d9877.pdf?index=true
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_260fba0a66244e7ba255ad00fc89eb2c.pdf?index=true
    • https://334e481f-4595-4613-8514-cf1b68b0f675.filesusr.com/ugd/a5bb32_937697268932489eac6e1b74ab728383.pdf?index=true
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_f65895680c124f59820430efc1aab760.pdf?index=true
    • https://s3.amazonaws.com/feliso/template_of_venn_diagram_to_print.pdf
    • https://s3.amazonaws.com/tajimipojimo/how_long_is_the_britax_marathon_good_for.pdf
    • https://uploads.strikinglycdn.com/files/2b57619f-d5d4-40f7-ae2c-8059b91b4e87/95956263064.pdf
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_eab22713b10149bd970c95d8e87a4110.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6beec71b-48dc-4d25-ade1-849c7c7ea705/74603601646.pdf
    • https://uploads.strikinglycdn.com/files/791f19b4-36e7-45b6-844e-61bb8f46603d/cung_me_xin_vang.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_off0000f2e2.bin
d653edfaf9f9f4eea4fb847e0569a7ed75ee365e2534f5d5d3b32c572cfb5f02
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 5176 bytes
font_01_sfnt_off00010462.bin
0a4746b8bb9c4437bc3b0a39e6c2af27499c65d5f4a90abe81b55cff99701954
pdf-font-stream PDF embedded font (sfnt) at offset 0x10462 10552 bytes