Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c55cef33bec4bd…

MALICIOUS

PDF

85.6 KB Created: 2021-03-20 14:22:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f49a730ab8ad03d41d2d2456f716ca8e SHA-1: 0e0dec11c4648da6fad27aa081b71f57b826cb41 SHA-256: 75c55cef33bec4bd1877658bebc30f4d88513470593755637fdb237affd0f299
246 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, many of which are flagged as suspicious or are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://soxebez.ru/strik?utm_term=what+is+grounded+theory+research+pdf PDF link annotation
    • https://bopamoverera.weebly.com/uploads/1/3/1/4/131408256/tivewujirugin.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/how_to_type_a_music_note_on_iphoneq7gzw.pdfIn PDF document text
    • https://vejazisiji.weebly.com/uploads/1/3/0/9/130969480/b40dff16.pdfIn PDF document text
    • http://wigomufeze.22web.org/arya_1_tamil_movie_songs_free.pdfIn PDF document text
    • http://denizan.com/emulator_android_untuk_mac0g8vs.pdfIn PDF document text
    • http://boomerangoo.site/physics_dictionary_java_app4i0jp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/81304b1e-684b-476a-b963-daeb421c973d/how_much_coffee_to_put_in_keurig_reusable_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebcf0e4a-15be-4145-8292-7b38a73ed4e7/honeywell_thermostat_th3210d1004_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b0545a3-f148-48ed-ad79-7ad1844f5611/71304061391.pdfIn PDF document text
    • http://gazugitub.epizy.com/pesexuziko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05fb7794-5dad-471e-aedb-2a9f61241121/whirlpool_top_load_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8a1b95b-cdb4-49cd-87ec-d001f3dcbb6f/gopro_hero_3_usb_battery_charger.pdfIn PDF document text
    • http://sotenuzalarabi.epizy.com/adobe_premiere_pro_cc_2020_tutorial.pdfIn PDF document text
    • http://rezutarewefiwup.epizy.com/26654514063.pdfIn PDF document text
    • http://karatufi.epizy.com/5285455575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a9bd9a-5844-4d00-9102-4d19718ff19b/what_does_mito_mean_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/197cdfbb-d84e-4cdb-9330-75e09bc8a55d/how_do_i_reach_dish_network.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b723fa7d-a2b6-4740-93f9-219b0c78d9e2/fluval_306_external_filter_noisy.pdfIn PDF document text
    • http://nesuzilusuk.epizy.com/36921434194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d81a7e1-9a9b-4f63-8848-c0a82ebb7f27/algebra_2_challenge_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a0b387-dae2-44f5-823e-bcb17f2c535a/96743194591.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 5380 bytes
SHA-256: fdc34f56a193cd209bb9fcb650c3cb97c45da6e36c7d8869e379bb2d70b20d78
font_01_sfnt_off000114f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F0 11240 bytes
SHA-256: e75fdc8f7a629becb9c27b52ab04db0d208e7593f7c49c4a1ea14f0f665430b2
font_02_sfnt_off00013b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3