Malicious PDF — malware analysis report

Static analysis result for SHA-256 efea5ab94d572843…

MALICIOUS

PDF

75.0 KB Created: 2020-12-26 08:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 165b5f003c9a0501d406cd4609248b1e SHA-1: fedd5123311d0e0d43525e2bf766e2abef06ce66 SHA-256: efea5ab94d5728434cb3453f351a06b78478daf488e4f04b93dc19fa610db61f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, which is indicative of a link farm or SEO spamming technique. One of the primary external URIs, 'https://traffking.ru/strik?utm_term=kingswood+umc+mobile+al', is flagged as suspicious. ClamAV and an ML classifier also identified this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://traffking.ru/strik?utm_term=kingswood+umc+mobile+al PDF link annotation
    • https://cdn.sqhk.co/kokuxisa/jjjijha/gospel_songs_2020_south_africa.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/9696467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420430/normal_5fa6f94857799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375503/normal_5fa97f20b05e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419836/normal_5f9f323cbeeec.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/4cd668fc-d140-414b-a406-e6badc178484/70187421438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3c8a78a-c985-4fd6-8afa-bf8953a81f37/44911566375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bde3941-87f8-4dc0-951c-9ab48b13fce9/christmas_plays_2019_in_los_angeles_ca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6a3e059-81c1-4731-be44-de3bb73cbb40/sas_zombie_assault_4_mobile_cheats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5de8e0ba-971e-4f40-acc0-c47fe8a1c23f/mi_propio_auto_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a76831a6-7fdf-4667-986d-78445d40bba5/16657755522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/962ee21a-e9f2-4f41-8637-a9b14dda6a25/27351813384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3efa983-27c1-43dd-8d85-c9e0ec505472/ogrillon_baldurs_gate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3706e245-84ac-4e2b-9b22-feaea0f7dd2b/breakfast_at_tiffanys_costume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4904e789-3f64-4d77-b2eb-95328ecf79b8/cool_math_tricks_on_a_calculator.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_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 5364 bytes
SHA-256: 0d356ebd53ea33738a92179a2717ba1c0876187605929f40e7fe5cae32e70149
font_01_sfnt_off0000facd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 10592 bytes
SHA-256: 2fbc3675a7f32a5368fb56ab4db33f98e3c72539e4d5c793788f30e80c34fd0e

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