Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb0bf5fa35016d7…

MALICIOUS

PDF

76.0 KB Created: 2021-01-27 01:57:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 04a195bffddba5252b0a8b3550a5a9da SHA-1: 4a219b738de5aa3aabb568e4951f7f8a7f65b0fa SHA-256: 8cb0bf5fa35016d76d831ea6bd71e8d0fe336e240cabaae2734acd75f8309ad8
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 domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites.

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://trafficel.ru/wb?keyword=tabela%20da%20chuteira%20de%20ouro%202020 PDF link annotation
    • http://repochka.site/tubivomesax5ztv2.pdfIn PDF document text
    • https://cdn.sqhk.co/risejesob/eCkjf2j/den_haag_fm_live_radio.pdfIn PDF document text
    • http://milanbeachs.space/23466598046k5kqt.pdfIn PDF document text
    • https://kanazotevixif.weebly.com/uploads/1/3/2/7/132740718/3cb97de312ca06b.pdfIn PDF document text
    • http://8gusevshop.website/centurylink_email_supportcch9i.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/aLC3jgM/open_file_manager_in_windows_8._1.pdfIn PDF document text
    • https://cdn.sqhk.co/bijukipuj/libujiq/23877760936.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/tfbsJje/lego_city_undercover_green_color_swapper_locations.pdfIn PDF document text
    • http://6gusevshop.website/doluvepifbnk7c.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/02gdggd/53933995853.pdfIn PDF document text
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/kotete.pdfIn PDF document text
    • https://libadelalisam.weebly.com/uploads/1/3/4/5/134579317/54f6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388052/normal_6004f01846235.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/hXgggdm/smart_connect_bluetooth_reel.pdfIn PDF document text
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/7bb8b75d742.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/AGhfHhc/cheapest_flights_from_glasgow_to_london_city_airport.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/m2jegho/monster_hunter_rise_release_date_pc.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/wibadinavosunom/shed_plans_12x12.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_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 5212 bytes
SHA-256: d57531513d4b8f514567f6f0bd8c30cb50b69014f2b014c8c0c0036159be7170
font_01_sfnt_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 12636 bytes
SHA-256: 63c3fb8d37341cdc1f76191e845f68af98b1aab54fecb6920006414537faef34

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