Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3100ef30e764dc…

MALICIOUS

PDF

111.7 KB Created: 2021-04-24 10:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0091920d3e1ff51d694bd92e28c75a50 SHA-1: b8bd13a9ab51f9b2f429abab8789c13ba231d23d SHA-256: 2b3100ef30e764dc197365b4b44e0ec3cc8f7aff2207368147ef4f3feefdd595
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The 'SE_CLICKFIX' heuristic indicates social engineering by instructing the user to execute commands, likely to bypass security measures and download a secondary payload. The embedded URLs suggest redirection to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/strik?utm_term=what+graphics+card+is+my+pc+using PDF link annotation
    • http://instasale.company/juvovexsde8h.pdfIn PDF document text
    • https://mugunujepigujov.weebly.com/uploads/1/3/5/9/135992134/fawevinibavo_lilisaxubexapa_mixobipavi.pdfIn PDF document text
    • http://s7hmus.org/kuwevirajo52gj3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494674/normal_60460e2f9acbf.pdfIn PDF document text
    • https://gejomomik.weebly.com/uploads/1/3/4/7/134719116/jareb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475987/normal_5fed0287b8e9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379384/normal_5ff8ce2eb91a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450898/normal_5fd9debe14ee6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374364/normal_5ff4cb0da08b1.pdfIn PDF document text
    • http://babysampler.com/how_to_set_up_powerline_12002hl2i.pdfIn PDF document text
    • http://lebawovuzob.iblogger.org/calcestruzzo_precompresso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_603c00bfa0c95.pdfIn PDF document text
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/gujivodew.pdfIn PDF document text
    • http://fitnesspack.net/waterfall_model_software_development_example51ebj.pdfIn PDF document text
    • http://uchebnoe.website/samsung_level_u_headset_user_manualibz73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368998/normal_5ff88885aca46.pdfIn PDF document text
    • https://gidutuzewefira.weebly.com/uploads/1/3/1/3/131380066/4081539.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/ed4dfe46-0229-42cf-90c6-06c633a41f7a/tizisafosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/222b32eb-228d-41e0-bf49-e8b673c43e1c/31993993208.pdfIn PDF document text
    • http://lifokuxebuxama.rf.gd/river_city_ransom_underground_food_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d344f74-0c3c-4f9f-a0a9-c93a8b8c79d0/what_does_alimentos_enlatados_mean_in_english.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_off0001773e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1773E 5572 bytes
SHA-256: e4ad7e8e9e740f9ad10c04260bb71e5d6a44112639ac2a52f4c5adf255b8cf60
font_01_sfnt_off00018a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A1B 11132 bytes
SHA-256: 7e5036096075ccab7b9571ee1cfa67b7e45d8167e7ec7aa69a149999f700e09e

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