Malicious PDF — malware analysis report

Static analysis result for SHA-256 390c1cd1bb105add…

MALICIOUS

PDF

80.6 KB Created: 2021-04-29 10:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3956785a57257f43a879908d9f869431 SHA-1: 2021efd64782eb958161f4c8ee3d31dfbb3974f1 SHA-256: 390c1cd1bb105add9e2affd6962f3c40af356297f374943d45e27dfe6be39778
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm, suggesting a phishing or redirection scheme. The primary URL appears to be a lure related to job salary information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://nipisod.ru/strik?utm_term=construction+project+manager+salary+tampa+fl
    • https://static.s123-cdn-static.com/uploads/4407781/normal_5ffd4a239ab0e.pdf
    • https://peninovafaron.weebly.com/uploads/1/3/4/3/134320426/lenosusazetatox.pdf
    • https://cdn-cms.f-static.net/uploads/4424996/normal_5fd6599a84ed7.pdf
    • https://cdn.sqhk.co/waxoxewanuvi/dBlhfjg/26730701800.pdf
    • https://cdn-cms.f-static.net/uploads/4366015/normal_6028240f4d827.pdf
    • https://zafewogi.weebly.com/uploads/1/3/1/4/131407253/c3f0a985a14ad.pdf
    • https://cdn-cms.f-static.net/uploads/4448724/normal_6010b668eae50.pdf
    • https://tupenozisi.weebly.com/uploads/1/3/4/0/134012303/2352413.pdf
    • https://cdn.sqhk.co/savunowudob/hhuhfhe/sudojonudobovazezikozev.pdf
    • https://cdn.sqhk.co/xavexapoxiv/dSIS2uY/how_to_make_clay_crafts_at_home.pdf
    • http://zonizubiro.getenjoyment.net/80529160771.pdf
    • https://duririsi.weebly.com/uploads/1/3/4/0/134096382/zefubegefuwemoxizi.pdf
    • https://cdn.sqhk.co/wofikubid/0G9jdha/wexavizefofebudamawe.pdf
    • http://koxelovanalimu.getenjoyment.net/cules_son_los_animales_que_estn_en_peligro_de_extincin.pdf
    • https://cdn.sqhk.co/rovifatira/czZLZih/bidufa.pdf
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/3791773.pdf
    • http://giwapozolaleg.mypressonline.com/bible_study_on_prayer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/49900667-6ed7-42a6-a987-8f390e1d9353/introduction_to_calculus_and_analysis_by_richard_courant.pdf
    • http://bugenerefajujus.atwebpages.com/72041138537.pdf
    • https://s3.amazonaws.com/fodose/15229977370.pdf
    • https://s3.amazonaws.com/nefomojuwet/22756632836.pdf
    • http://futakanawus.onlinewebshop.net/12154535501.pdf
    • https://uploads.strikinglycdn.com/files/44c9aa46-57c6-485c-b1bb-8b5eb9ec30a3/thinkpad_t430s_memory_upgrade.pdf
    • https://s3.amazonaws.com/libusamagowuvo/sawarigi.pdf
    • https://s3.amazonaws.com/dufekifaral/national_interagency_fire_situation_report.pdf
    • https://s3.amazonaws.com/gogoxowiniza/pearson_chemistry_book_answers.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef0d.bin
81e9c7dea14744bf79e82ebe8bb61575b0a4d134988193ad0147492e91d0b800		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 5420 bytes
font_01_sfnt_off00010174.bin
d100cbbeda244908a9e9f963d64e1448756d54b3050c729e5f7cc6c3e4894079		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 10832 bytes
font_02_sfnt_off0001265d.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1265D 4324 bytes

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