Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5df2925524f7c79…

MALICIOUS

PDF

185.0 KB Created: 2021-04-06 10:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b7f16fa0daf318a77312cb1fd6c3dc3a SHA-1: b22ccc932458acee075473769166deb6d6b1ddee SHA-256: b5df2925524f7c794d2cc3b2c087cec71119d9e471bdd9f293a8acd3607588ac
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or redirection mechanism to host malicious content. The presence of external URIs and the overall structure indicate an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://jumiwimov.ru/wix?keyword=amar+o+depender+pdf+parte+2 PDF link annotation
    • http://biomaniks.website/accountancy_class_12_notes_free_downloadkzpnb.pdfIn PDF document text
    • http://testrun.ru/irregular_stem_changing_verbs_spanish_preterite6pn5a.pdfIn PDF document text
    • http://buyfastedcircle.xyz/how_to_find_my_four_digit_zip_codeurqmr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_605d6b7567f87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404105/normal_5fd8da6fa5f1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374545/normal_60579e1d7909a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455669/normal_6060effb9197a.pdfIn PDF document text
    • https://cdn.sqhk.co/butexuvokufo/fgjheSh/81123748672.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391000/normal_5fed802a51e41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_604f33917fc5b.pdfIn PDF document text
    • http://sehq.xyz/xubigajumohy3kl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466367/normal_606b9c8c26efa.pdfIn PDF document text
    • http://neyroskakalka.site/autocad_bathroom_sink_blocks_free_downloadaycs2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476924/normal_5fcd17d62cd8f.pdfIn PDF document text
    • http://youtube-subscribes.com/81976995040oos66.pdfIn PDF document text
    • http://reactivaperu-2020.com/descriptive_statistics_by_variable_spssh9g9b.pdfIn PDF document text
    • http://solapp.xyz/are_club_car_golf_cart_keys_universal4uygl.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/hjiyMEO/best_electric_train_set_for_christmas_tree.pdfIn PDF document text
    • http://scarcebook.com/verbos_en_ingles_y_espaol_regulareswg55s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_38015b659fcf408490c1ab9b85e368c4.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_825b09e811274f96b5fa648774298828.pdf?index=trueIn PDF document text
    • https://0face946-3507-4f1d-9804-30df5ac990e4.filesusr.com/ugd/8dfcc1_45774f814bc54508863b3b9bc2bb63f4.pdf?index=trueIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_986156d7a2bc424a946062716bda4837.pdf?index=trueIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_91bf910e091a4e55aa1797aa5747ff11.pdf?index=trueIn 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_off00029b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29B32 5096 bytes
SHA-256: e44836598c2cdc87914a2948064cdf8ef395a5313063f0742a5d02b115f7bd4f
font_01_sfnt_off0002ac71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AC71 12528 bytes
SHA-256: 79d58e5f5452cfa685b958af7c153b817fb107322e1f8ca4c89fb6d5b60baf34