Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f47734dcf0a1c8f…

MALICIOUS

PDF

93.9 KB Created: 2021-05-21 06:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d73778329e180bcd3fbc5319093e9b63 SHA-1: 28564daf1bc2d9a49304f1aaac78c8fd7dd18aef SHA-256: 4f47734dcf0a1c8f9e7f88a84e32f4581120f738783b131087ea90e0550c6ae3
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 services, indicating a link farm designed to drive traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic firings related to SEO link farms point towards an attempt to manipulate search results or distribute malicious content through a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=how+to+program+a+uniden+bc365crs+scanner PDF link annotation
    • https://vezajufarazigur.weebly.com/uploads/1/3/4/2/134265717/furumubimoxije_jovepuxuziwe_gekugalu_mefamadosifi.pdfIn PDF document text
    • https://pixerogamaba.weebly.com/uploads/1/3/1/8/131871590/2602369.pdfIn PDF document text
    • https://vojizozovogimum.weebly.com/uploads/1/3/0/7/130740342/3339298.pdfIn PDF document text
    • https://wagoburaf.weebly.com/uploads/1/3/4/5/134524365/tejebekozefa.pdfIn PDF document text
    • https://dijujuvosidig.weebly.com/uploads/1/3/0/8/130873718/fonosemadib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_6031211ba8e67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388422/normal_6007faeb696b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379736/normal_5fe1d227cd352.pdfIn PDF document text
    • https://jowiroluka.weebly.com/uploads/1/3/4/3/134336896/zabebeponegopeg_kowesedog_binobebugafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483587/normal_6009d7d1ac505.pdfIn PDF document text
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/juzope_libugiwemi_soxudi_jewivin.pdfIn PDF document text
    • https://dulipitigisol.weebly.com/uploads/1/3/4/7/134717891/zedin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451018/normal_6000202a9577b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/166f02ab-3f28-4c19-a2c6-e76e5addc0f1/32358130565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d609393-671d-4c67-818a-577ee784d149/3681209739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4316f447-b87a-4184-9e8d-c8be2d649e31/50_shades_of_gray_movie_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1cd4514-4665-487c-94cc-ebabf7f7bc7f/how_do_i_setup_my_asus_rt_n12_as_a_repeater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0e29747-b319-415a-b7cd-f18ab56b8bc6/90362753874.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/benson_ken_worship_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/nojolovenakukinonola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d941f72-548a-4d5f-b81f-ddd00f478958/fubukorutaba.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/laserulon.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FD 5996 bytes
SHA-256: 18327528d01722facd8cd4e52706023fce12f62297eef6b96c32868ff17da241
font_01_sfnt_off00012759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12759 13556 bytes
SHA-256: 7c1efe8ed41c3c2b23d9140a9c421927ac99047e895cee51be401c65ad5e794e
font_02_sfnt_off00015494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15494 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15