Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a1c41b0a4f3626…

MALICIOUS

PDF

75.5 KB Created: 2021-02-25 12:01:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 21886b000241b4e3e97778397c675f53 SHA-1: 85c9c04c4a96c136faffbd43092420a0ef6c4c68 SHA-256: d7a1c41b0a4f3626b71c222522efbcd3da083053bc7699c4a83d0be1f29785ac
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik?utm_term=jane+austen+pride+and+prejudice+book+download'. This URL is presented within the document body, disguised as a book download, indicating a phishing or social engineering attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient to infer a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=jane+austen+pride+and+prejudice+book+download In PDF document text
    • http://rubewox.sportsontheweb.net/what_is_light_olive_oil_made_of.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/list_of_american_army_ranks_in_order.pdfIn PDF document text
    • http://rankingcoach-apps.com/jisagisesixukizareljr6qv.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/what_anime_is_one_punch_man_from.pdfIn PDF document text
    • http://titanof-filtr.ru/cmo_ganar_amigos_e_influir_en_las_personas_audiolibrogvtgh.pdfIn PDF document text
    • http://simcars.ru/wazimatejewimugu8is64.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/gonafoziguwewe/carte_de_visite_format_amricain.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/bolufuj.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/rectangular_pyramid_volume_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/fundamental_of_mathematical_statistics_solution.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/72899118157.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/java_swing_gui_tutorial_netbeans.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/zumubipegejugupitapuki.pdfIn PDF document text
    • http://puzegekizizovin.epizy.com/2095831800.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/ri_hoisting_license_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/cpwd_publications_manual_2014.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/manual_de_policia_judicial_colombia.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_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 5428 bytes
SHA-256: 1948d8cfff9046ee40d25c4bea31f222fa2880de36d5272e60361060a7f6d716
font_01_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 11760 bytes
SHA-256: b10daf24f93ad1e3485a9df0f940efb0c65a74280a17dbd0f9524bfedb6bff60

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