Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28698ea447e9416…

MALICIOUS

PDF

82.6 KB Created: 2021-04-01 01:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 329a188089ee2781dcc6ac57f0ea5eb1 SHA-1: 66e77fc028a32c05faf800d18868a050221057ce SHA-256: a28698ea447e94162b76a9ab8c4f3ba0584144107339964325ea2d564286d88c
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, with several pointing to suspicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and the ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded JavaScript, though obfuscated, likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/123?utm_term=hanuman+bhajan++karo PDF link annotation
    • http://vas-rem.ru/49911753267hmqel.pdfIn PDF document text
    • http://electorat.org/newezimijox561te.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/90112308211s256e.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/DSAhiBL/arcade_donkey_kong_emulator.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/gjchfhh/katekyo_hitman_reborn_english_dub_watch_online.pdfIn PDF document text
    • http://toluvubub.mygamesonline.org/captivated_by_you_sylvia_day.pdfIn PDF document text
    • http://smartycredit.info/xoxokufinugm833l.pdfIn PDF document text
    • http://zumbayuliya.online/23571006598grunv.pdfIn PDF document text
    • http://xezixaz.getenjoyment.net/police_blotter_sample.pdfIn PDF document text
    • http://ganedoxumizaj.sportsontheweb.net/13662342046.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/myers_psychology_for_ap_unit_5_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcb6acb9-e187-49b2-b191-10126ad8c495/fuseba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13327f25-6c67-4b11-820a-7cf29d3779ec/nizokil.pdfIn PDF document text
    • http://netawuwimirixor.onlinewebshop.net/adjusted_odds_ratio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f62ca2c-7276-4cdc-a2fa-6e0022566a87/how_to_reset_a_dish_hopper.pdfIn PDF document text
    • http://lukafimagog.atwebpages.com/abstract_reasoning_test_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/980c59e0-0cbe-4262-bc0b-ece5fa2c9a5e/57330495519.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/vakefikagusisovi.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD4 4956 bytes
SHA-256: 67e50405c3ce626d6689c1374c3b418e6427f05a3fa6da6bd8b7d78171f67641
font_01_sfnt_off0000ec80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0000f7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 11328 bytes
SHA-256: 51be06416aca0cdc2114eba5dbcaecbd59f08c13a90d1f3d435de00cedf3be98
font_03_sfnt_off00011ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC8 9448 bytes
SHA-256: d1b4231e55502ec34784e46692f65f71b551fb3d391d1b78eb44c98b372dbcad

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