Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b77ad2e5eac291…

MALICIOUS

PDF

82.1 KB Created: 2021-05-03 12:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6342fc55883dabc9db4c5b72c4dd844e SHA-1: 6bdbd41495c3b4f94bf1cf1913ce3defdc3ecc1a SHA-256: 17b77ad2e5eac291a5c9e2739aa36b876db289cce71bd5066ecad91873fa8e2d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The heuristic 'SE_CALLBACK_LURE' suggests the document is designed to trick users into calling a phone number, a common tactic in callback phishing scams. The presence of multiple external URIs, some pointing to disposable hosting, further supports a malicious intent to redirect users to potentially harmful content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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) 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://resalured.ru/strik?utm_term=how+to+pay+business+taxes+in+florida PDF link annotation
    • http://zanefuw.iblogger.org/97826938672.pdfIn PDF document text
    • http://dedekuwetom.iblogger.org/jonudavaxupijapakowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_606af548bb6cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460266/normal_6054c9296d5a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501233/normal_603cbcdd73092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5fd3a0cd4350f.pdfIn PDF document text
    • http://wibimozuj.22web.org/adverse_drug_reaction_reporting_health_canada.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
    • http://deketinak.rf.gd/78774625400.pdfIn PDF document text
    • http://tibelobal.epizy.com/problem_solving_with_c_9th_edition_download.pdfIn PDF document text
    • http://sotegoduwibadaj.epizy.com/save_me_queen_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb2341cf-2f22-4beb-b909-ddcc1b6ff3f3/69320378093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d6656c3-e4cd-488c-8205-7dc946ca14e5/best_way_to_cook_flank_steak_on_george_foreman_grill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57038aa2-4f3f-43c8-ac61-a25890e9c4a5/woman_ukulele_chords_john_lennon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18d8ee89-4b57-4f5c-967c-c280cdda05cf/how_much_does_saxophone_repair_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3cccf8d-c788-4837-bca4-ebdc5e291293/how_to_prepare_for_ochem.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_off0000f65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 5280 bytes
SHA-256: ea4f10b9fde3587f603a85199bc7cddee4a212b7367880cbda071c594a09b1f8
font_01_sfnt_off00010866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10866 10772 bytes
SHA-256: a8fcf0ff3f2c8f7906ce228d1badfdadaede2a37ec5eb792c27cc635dce4486e
font_02_sfnt_off00012d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D35 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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