Malicious PDF — malware analysis report

Static analysis result for SHA-256 038bc0c1bc7a101b…

MALICIOUS

PDF

101.6 KB Created: 2021-05-25 03:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21d53f953bdf9bc1690a76595394b69b SHA-1: 91fa0f800b23f658aa51dd01a2e87e0856b51858 SHA-256: 038bc0c1bc7a101b10e6a6aa3000cd683ab505f69a130218d1b49fc7044da73b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with one prominent URL pointing to 'vilenefex.ru'. This suggests an attempt to manipulate search engine results or direct users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=is+credence+a+lestrange
    • https://cdn-cms.f-static.net/uploads/4450876/normal_606a97793b40d.pdf
    • https://jarupaxalimex.weebly.com/uploads/1/3/5/3/135324443/6f661e337.pdf
    • https://cdn-cms.f-static.net/uploads/4445325/normal_5fd98eb4144e3.pdf
    • https://lepudumewo.weebly.com/uploads/1/3/5/9/135962044/6127269.pdf
    • https://pikemane.weebly.com/uploads/1/3/4/7/134775920/276110.pdf
    • https://cdn-cms.f-static.net/uploads/4386074/normal_604650f10f92b.pdf
    • https://cdn-cms.f-static.net/uploads/4417526/normal_606a56a4d5d49.pdf
    • https://cdn-cms.f-static.net/uploads/4386361/normal_60134540157e7.pdf
    • https://cdn-cms.f-static.net/uploads/4417992/normal_60270be1e4b49.pdf
    • https://static.s123-cdn-static.com/uploads/4368972/normal_5fcd547fb758d.pdf
    • https://xapakezadumow.weebly.com/uploads/1/3/4/6/134609197/9c7d57f48dd5cc2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fajixe/cerfa_formation_maritime.pdf
    • https://s3.amazonaws.com/xamapebonijos/is_esv_a_good_bible_translation.pdf
    • https://s3.amazonaws.com/zikeko/juxenipube.pdf
    • https://s3.amazonaws.com/zagubip/97265292431.pdf
    • https://s3.amazonaws.com/baxegezivumi/google_sheets_transpose_cells.pdf
    • https://s3.amazonaws.com/fedure/burger_king_nutrition_spicy_chicken_sandwich.pdf
    • https://s3.amazonaws.com/jevedijadiki/taurus_pt111_g2c_shoulder_holster.pdf
    • https://s3.amazonaws.com/winumigutam/lights_in_the_sky_tonight_scotland.pdf
    • https://uploads.strikinglycdn.com/files/74b31682-f049-457a-ad14-81377750b6bf/how_to_find_wifi_password_for_hp_printer_3630.pdf
    • https://uploads.strikinglycdn.com/files/a57f1e8f-feec-44ba-9ec1-6c3305b552b9/hp_deskjet_5150_printer_service_manual.pdf
    • https://s3.amazonaws.com/tixeligufokup/jodonarezetivugadusi.pdf
    • https://uploads.strikinglycdn.com/files/eccc5270-d3ce-4f21-bb7b-efc57effa0d3/what_are_the_levels_of_comprehension.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_off00014968.bin
d626dd7739564475afda88dac03a00f80b640e1e0f7066a56c4ffdb26e984fef
pdf-font-stream PDF embedded font (sfnt) at offset 0x14968 5044 bytes
font_01_sfnt_off00015a9a.bin
7a473962c7fcaf19ee592a532f60170a5a493d827988ee11187aeeeaaff3f315
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A9A 15648 bytes