Malicious PDF — malware analysis report

Static analysis result for SHA-256 422fd77f27d0092d…

MALICIOUS

PDF

82.4 KB Created: 2021-03-08 19:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 800902d5b931c3000aa2ad23a9e1629e SHA-1: 615cbbe36c8f9ca247270829f3e99ddc2f8014a4 SHA-256: 422fd77f27d0092daab8e9c5373c74ed4b57ee658711e0e90e8db21dcb046df0
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to editing PDF files, likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://xezojetit.ru/award?keyword=edit+pdf+file+free+software PDF link annotation
    • https://misajutedatid.weebly.com/uploads/1/3/4/7/134755713/bakimit-xaxaxoxav-fenenuxa-vawenet.pdfIn PDF document text
    • https://zokemubolito.weebly.com/uploads/1/3/4/8/134895641/5551540.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/how_much_do_interior_decorators_make_an_hour.pdfIn PDF document text
    • http://gewebufokorilu.iblogger.org/xelesodidewikavujizovo.pdfIn PDF document text
    • https://ketowijogi.weebly.com/uploads/1/3/5/9/135985413/mibumufug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_095ca40032984052b737c1738bcd0b9b.pdf?index=trueIn PDF document text
    • http://zewomasajeguzud.epizy.com/cadence_of_hyrule_demo_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/90618667377.pdfIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_33f2112356bd4583919b01d0f91e3e09.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/executives_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/71037032804.pdfIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_10b62e8b09dd490c9c37990a45797915.pdf?index=trueIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_7523d61b9d5d40f1a007e34c2584ca36.pdf?index=trueIn PDF document text
    • http://wetovokerug.epizy.com/chambers_of_xeric_osrs_solo_guide.pdfIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_6666320ea33c4c11ae7e0337b6c443ad.pdf?index=trueIn PDF document text
    • http://fazaburifug.myartsonline.com/hp_officejet_pro_x576dw_multifunction_printer_service_manual.pdfIn PDF document text
    • http://wodefelid.rf.gd/how_to_check_ink_levels_on_hp_printer_deskjet_3050.pdfIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_62c077144fc84e7bb871988a2152fa35.pdf?index=trueIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_0e58bb73a62c45a1b7883fcabcb30f9f.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_e879bf7218c44a18b10c79ef29f53c49.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001203e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1203E 17980 bytes
SHA-256: 41e21705bfd3c82b4e090e719a33b1969f1bc43cc3f714865aed9519a038e5b6
font_00_sfnt_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 5084 bytes
SHA-256: 327c255e5207ebe1f6ed6675ad197fe1c20bd8ab17846ca9a121f8eab5abfee5
font_01_sfnt_off0000fd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD21 10184 bytes
SHA-256: 004a82513f9a0a9d26eb217f5e00ccd0893c60f1f91736541cbd3c43dd6ea5f0

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