Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae756440fb7f34c…

MALICIOUS

PDF

70.8 KB Created: 2021-03-01 20:55:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6bf50ad2b2ce93ac17a96d6a6e6caf54 SHA-1: c3d596ae06363935aaa32d240b816d26799879fc SHA-256: cae756440fb7f34cf8231bbf932d0a3fd66b7e979fca8fa14d509c8ef3e83a49
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content or visiting phishing sites. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://bologen.ru/wix?keyword=lenovo+photo+master+user+guide PDF link annotation
    • https://cdn.sqhk.co/dusaradezat/ieijENN/download__extreme_car_driving_simulator_10.pdfIn PDF document text
    • http://gezulexod.iblogger.org/rikozopimufawoketosum.pdfIn PDF document text
    • https://cdn.sqhk.co/desixurate/ejtqaMO/talking_parrot_breeds.pdfIn PDF document text
    • http://divuwon.iblogger.org/tracfone_alcatel_a205g_user_manual.pdfIn PDF document text
    • https://foguvebosep.weebly.com/uploads/1/3/5/3/135315209/41cb0a1192f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421224/normal_60241af9381e8.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/zejizafujizusev.pdfIn PDF document text
    • https://cdn.sqhk.co/berirenike/djc4T6q/chest_freezer_near_me_home_depot.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/descartes_meditations_summary_3.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/hdjj3gj/xexiludopeboju.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/m-audio_oxygen_25_user_manual.pdfIn PDF document text
    • http://galajanexagaj.iblogger.org/18525063244.pdfIn PDF document text
    • https://lulegosepo.weebly.com/uploads/1/3/0/9/130969478/b7f44c05025.pdfIn PDF document text
    • http://xonejalevesezom.sportsontheweb.net/70378698957.pdfIn PDF document text
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/8912733.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/bAJgOmn/instagram_hashtags_for_likes_and_followers_app.pdfIn PDF document text
    • https://pejagefetem.weebly.com/uploads/1/3/0/8/130815482/xefusaj-tidimudoxogupix-jesepuna-woxizovofexu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://donafilozevore.rf.gd/tukuvasoginogarugupisanag.pdfIn PDF document text
    • http://vapovalexuma.epizy.com/11120085025.pdfIn PDF document text
    • http://vasazizo.epizy.com/derobuwapeno.pdfIn PDF document text
    • http://batofudinub.epizy.com/mewafiwesobomere.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_off0000cd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD28 5340 bytes
SHA-256: 9fb3a4a972b2825d0193aa85f23f7d816351616049f2753e888cc9d8bb800b31
font_01_sfnt_off0000df2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2C 14072 bytes
SHA-256: 5a121b1e345383299e8a9ff97bd021d71573327b43c9046c7fdef84ff19d3e5d

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