Malicious PDF — malware analysis report

Static analysis result for SHA-256 19027b42c7003e4c…

MALICIOUS

PDF

91.6 KB Created: 2021-04-05 02:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 7c80768c7ed95bcb52ab7969dbc710c7 SHA-1: 24c88c12e4b054f1d50cc54e1b27eac6f91c41ea SHA-256: 19027b42c7003e4c111a67fcfaa3d53c98529788391aaa8dc1e57b8be6ffe029
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of seemingly legitimate but ultimately untrustworthy domains. The presence of external URIs suggests the document's primary purpose is to redirect users to malicious websites, likely for phishing or malware delivery.

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 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://kuzutuzo.ru/award?keyword=the+blue+book+of+grammar+and+punctuation+pdf+free PDF link annotation
    • http://ohota-ribalka.online/tuning_motorcycle_spokesc1tt9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383577/normal_5ff815f9ca63c.pdfIn PDF document text
    • http://dronextactical.xyz/84922634034t26z2.pdfIn PDF document text
    • http://italy50wow.pro/evenflo_infant_car_seat_cleaning_instructions7dd5j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452381/normal_6065aae64b275.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5fef94aa2e1de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5fc96b81eb8fa.pdfIn PDF document text
    • http://wokizunapajunez.iblogger.org/bloqueo_auriculoventricular_de_3er_grado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_602b3a6a91620.pdfIn PDF document text
    • http://mgacessoria.online/fagibujanajavelegqkzbq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_fbba9d91095c4251adb79b3694d0f653.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/459b2650-f187-4249-a0ae-c79905726b4a/dugefoxetovakojiba.pdfIn PDF document text
    • http://takikixak.rf.gd/bluedio_bluetooth_headset_driver_windows_7.pdfIn PDF document text
    • http://wubokukinav.epizy.com/mimemuruse.pdfIn PDF document text
    • http://pefodajisotavuk.rf.gd/software_attendance_management_solution_x100.pdfIn PDF document text
    • http://betiravel.epizy.com/25819825008.pdfIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_cdd2e0e300b14a2f992ae1ff85aef3ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22a1cf1-b86a-4283-95c7-85ef1834ad58/57791895258.pdfIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_5e03f527c0514af1b2ddfa67e67c15b9.pdf?index=trueIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_53ec19ada3734d3787bd4a0c26c12321.pdf?index=trueIn 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_off00012329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12329 5544 bytes
SHA-256: 71cf710f8a0b975f1bd5904c499e535b2b40b49cc3e4419a840b530f2448cdc6
font_01_sfnt_off000135d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D9 12696 bytes
SHA-256: 75745539b1ecb4b6986d948b8d6470e55ac4c669f692baecd1ddf71b81378a8e

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