Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec48ad23624276be…

MALICIOUS

PDF

74.7 KB Created: 2021-04-02 08:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 73ed8d7d6ec31aafdf3f1699f817bfd9 SHA-1: 0f9d99dd28fecf3f01db21e8ab00316154a73ec8 SHA-256: ec48ad23624276be7a130bbc12312663ef5fa9a14a457e31e5f57e3758d8fea2
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of SEO spam or phishing lures, directing users to a redirector URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded links and the overall structure suggest an attempt to exploit user trust for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=shoretel+230+manual+call+forwarding PDF link annotation
    • https://cdn.sqhk.co/dugelabomaw/jiajdhj/free_online_multiplayer_racing_games_pc.pdfIn PDF document text
    • https://vaturelola.weebly.com/uploads/1/3/4/7/134704713/tegolabokuj.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/jdEMYxY/sigagibanovezujilupad.pdfIn PDF document text
    • https://suzagadagaxu.weebly.com/uploads/1/3/0/7/130775939/tigumanuwoz.pdfIn PDF document text
    • https://cdn.sqhk.co/lakivasulis/ghZMy4R/ios_10_launcher_apk_full_version.pdfIn PDF document text
    • https://dazenesulamese.weebly.com/uploads/1/3/1/1/131164173/0bfadafb4ccfc8c.pdfIn PDF document text
    • https://sejexogubason.weebly.com/uploads/1/3/1/0/131070030/1287088.pdfIn PDF document text
    • https://cdn.sqhk.co/nesuxozajek/fhhJieX/nail_designs_2020_acrylic.pdfIn PDF document text
    • https://xawefiku.weebly.com/uploads/1/3/4/7/134753490/f6837de45.pdfIn PDF document text
    • https://fiwitoritare.weebly.com/uploads/1/3/4/5/134582968/2165749.pdfIn PDF document text
    • https://xazojitov.weebly.com/uploads/1/3/1/4/131408465/514609.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/zarevizebi/gotapelevipodudaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90be1ec3-ba42-47ec-920f-9168d140d8ca/who_is_the_v_shred_guy.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/instagram_apk_mod_rexdl.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/mcgraw_hill_7th_grade_science_textbook_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4a5862f-11df-42ab-a745-3d69a2aa082a/25371842929.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/que_son_los_residuos_organicos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19db6736-8c37-4760-860c-793ef6dcc7bf/lotewezudegogefotuwezape.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/47072045348.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/79016661305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e78dcf3-95c2-40b8-af9b-d68a2605a287/anker_bluetooth_keyboard.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/mawokabovevijixozilol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef1b2145-3edc-4b76-b111-8ce7befb0bfc/what_is_a_calliope_keyboard.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_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 5888 bytes
SHA-256: 1b08589ece2400016b8f093bdc3e96584ddad1e3bce3dd4ed0d59a78a2f069ff
font_01_sfnt_off0000f980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 10408 bytes
SHA-256: 81cc0152bc0a72493def3cabb69eec44faf9b5f4acf676070626e06a6c5310f3