Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab95a60322138e0d…

MALICIOUS

PDF

81.0 KB Created: 2021-04-17 01:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c29a1f83a8a61a913cf245bd870cb41f SHA-1: 2b9936220d22d7abdb85c5bed87331f038a57062 SHA-256: ab95a60322138e0dc608b47c6a0a2655319f88f25f463ef1d907d4a7194f9ae7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a deceptive link structure. The presence of external URIs suggests the document's primary purpose is to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=learn+to+draw+step+by+step+youtube PDF link annotation
    • http://mutujejeturuduf.medianewsonline.com/44602894718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_6031eff6d0979.pdfIn PDF document text
    • http://ch-redirect.icu/the_stand_cbs_reviewjzedm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383574/normal_603148b22ca90.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/jusuruwivubemazevesopag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365567/normal_5feee177e5b85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499979/normal_6015cf81de178.pdfIn PDF document text
    • http://operationhomeplate.com/bamejadivirobijokumitamg91no.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415935/normal_5ff258a7dce30.pdfIn PDF document text
    • http://fetesitomer.mygamesonline.org/karejujovu.pdfIn PDF document text
    • http://secret-empire.ru/13438440339cuhr6.pdfIn PDF document text
    • http://remeik.ru/new_android_mobile_phones_under_15000u2z2y.pdfIn PDF document text
    • http://harkateine.fun/adblock_google_chrome_apkakzrj.pdfIn PDF document text
    • http://freshmind.net/image_quiz_questions_and_answers3h8h0.pdfIn PDF document text
    • http://henrysavbr.site/the_giver_chapter_12_and_13_questions5uvot.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/65b3cd57-cc0e-449b-81ba-58d1209b91a5/gegatazimufofofisizen.pdfIn PDF document text
    • http://guseboses.atwebpages.com/powerpoint_presentation_examples_for_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8a3882a-4a18-4dc1-bd38-279e7f2c5558/best_size_all_american_pressure_canner.pdfIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_08b448b1af804eb5aeba017b36472ae4.pdf?index=trueIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_ae287a5dbc474ace972832523e8ee6aa.pdf?index=trueIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_89071898f0f848c8a7ccf1e089ac2a7d.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_off0000febb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 5196 bytes
SHA-256: e984cf9401ba901f152928d18fe30cebdd5573095d4abdbb96d431e3ac6ed687
font_01_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 10824 bytes
SHA-256: e516d39b914fe43a59672279114101cea572817f0e9fd8a494a3c81463e1ace6

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