Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7eb029de8dbddd…

MALICIOUS

PDF

76.0 KB Created: 2021-04-23 07:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 222e69e522db8bde6179f96622a4bffb SHA-1: df37666e5400b3f6bdc82d721900b46dbb9531d2 SHA-256: 7f7eb029de8dbdddbe6a20333d7732506afd7eee4d6dc19546f5ffafe28ab9c5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files, suggesting a link farm or content stuffing tactic. The primary external URI, 'https://resalured.ru/strik?utm_term=grade+2+english+comprehension+worksheets+pdf', is likely a malicious redirection or phishing page. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=grade+2+english+comprehension+worksheets+pdf
    • http://kobivoweder.mypressonline.com/46005318400.pdf
    • http://fejiximodanu.mygamesonline.org/six_sigma_black_belt_training_material.pdf
    • https://cdn.sqhk.co/towevefizub/NUhfjgR/pemelufofepep.pdf
    • https://cdn.sqhk.co/lasanamemego/DgdkRnn/best_bottle_flip_challenge.pdf
    • https://geguwuwivoloko.weebly.com/uploads/1/3/1/6/131636947/4694061.pdf
    • https://ruxabetuju.weebly.com/uploads/1/3/2/7/132740595/toduluferutefojizaz.pdf
    • http://fikebek.sportsontheweb.net/jeroxidonetasivewunus.pdf
    • https://rusijarumeza.weebly.com/uploads/1/3/1/8/131871651/binorukekame-bokadekap-jaxabumuz.pdf
    • https://xumotisububilup.weebly.com/uploads/1/3/4/5/134591263/bepumubowopinaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/172d9ce4-fa6f-4d0d-94b0-9feeaa6e2013/easy_german_books_to_read_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/449c2bce-e51f-4725-832b-559d4c4c0ecd/samsung_galaxy_note_4_price_in_pakistan_whatmobile.pdf
    • https://uploads.strikinglycdn.com/files/598d95ef-aff4-4170-a224-d1785580bfdc/92058706722.pdf
    • https://uploads.strikinglycdn.com/files/65907ab9-d4dc-4300-ac60-a6863c210b9f/3_times_tables_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/53c2af21-c05f-4a0c-a8dc-2395a53d634c/oreilly_python_tutorial.pdf
    • http://gosaduzunake.myartsonline.com/present_continuous_tense_passive_voice_exercises.pdf
    • https://uploads.strikinglycdn.com/files/6f45f3fa-d2fe-485b-8afa-c0a9b02978b6/mamiya_rz_lenses_on_rb.pdf
    • http://fufuzadawefor.onlinewebshop.net/vuziwoboxowamurazol.pdf
    • https://uploads.strikinglycdn.com/files/12902142-47c9-4d1e-823e-09830d4ad0b9/which_engineering_course_has_more_job_opportunities_in_india.pdf
    • https://uploads.strikinglycdn.com/files/8f726aa0-6243-41ab-8cfd-8875a2694e13/19446966306.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_off0000e813.bin
5a8e9da091f1f5ad25188aa82ecc8961aa43cebf4a8a3eac3f08d297e165ef18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 5888 bytes
font_01_sfnt_off0000fc11.bin
fe21af21cc639887e289a4b65d54ca8da895b6db0a12fddf979aa60e40c309f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 11188 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.