Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd36570c8a5228a…

MALICIOUS

PDF

67.6 KB Created: 2021-03-05 16:53:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9094aeabff4c784ecc7398166fc1afa SHA-1: 742db8a433ec1912f0080e9619186d6d172dd512 SHA-256: dfd36570c8a5228a7826d3325d25e71c865737f41fc7f4242a7561c6163a2a58
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, with one prominent URL pointing to 'resalured.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further supporting malicious intent. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious content, likely leveraging embedded JavaScript for exploitation.

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://resalured.ru/aws?utm_term=concentration+and+dilution+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4505358/normal_600d641d53725.pdf
    • http://lesantyqas.online/examples_of_satire_in_animal_farm_chapter_1tp0do.pdf
    • http://groby-ritual.online/why_wont_my_electric_pressure_washer_turn_on4bba1.pdf
    • https://static.s123-cdn-static.com/uploads/4403413/normal_5feb1a00a3537.pdf
    • https://cdn.sqhk.co/jeporikate/igH8jjx/working_days_calendar_2019_canada.pdf
    • https://cdn.sqhk.co/wodaximewule/5AAroni/wolf_live_wallpaper_pro_apk.pdf
    • http://zakoroxani.22web.org/12_weeks_pregnant_ultrasound_report.pdf
    • http://trikolor.site/64343851306tuaqx.pdf
    • http://sirofopunisatus.iblogger.org/davesokaraxabopuzut.pdf
    • https://cdn.sqhk.co/terasovo/HX9ic0P/43083063002.pdf
    • https://cdn.sqhk.co/nuzitomizaj/vqvgghg/zijefesotox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bdd8c2e8-465f-4d9e-b378-06994c9834a3/dyson_v6_motorhead_cordless_vacuum_reviews.pdf
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_c389b01436d64172a8b289fa852bb157.pdf?index=true
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_dee4f53cd31b480aba68dc57842465be.pdf?index=true
    • https://uploads.strikinglycdn.com/files/27e47dcb-ea47-42cb-bf15-16d1a3a18076/53927574140.pdf
    • https://uploads.strikinglycdn.com/files/0905410a-496d-4944-9fc3-f1aa235172fc/bluebeam_revu_for_ipad_cost.pdf
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_76362e3ec665452d86f3eb4930a555ee.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a0bd726c-b776-4602-95a0-de3f7184c8a5/33849522113.pdf
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_fec925cb2ca74b58bbc3e568c8001d47.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb7a.bin
3536b49001aab8fb2ce414325ab33978f6cdbb4a7397336c5e4100ec2067084e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7A 5088 bytes
font_01_sfnt_off0000dccf.bin
ec26bd6c01fca7b33cefa093ff6880b190cea70ef73e90f068b3aa5dd9847598		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCF 10020 bytes

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