Malicious PDF — malware analysis report

Static analysis result for SHA-256 e113054a1aabd14f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-21 00:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2931d46cb709d9f6c32bb14f3072937 SHA-1: 48203a4c57cb37035c28d4ad2307c12d6b6529e3 SHA-256: e113054a1aabd14f761594f03ec19ef96cfe3a2c012e32c8d7e6877ee794fd31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's a link farm designed to host numerous links on disposable domains, likely for phishing or malware distribution. The embedded URLs point to suspicious domains, and the ML_NYX_PDF_MALICIOUS score of 0.996097 strongly supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://allytemp.ru/uplcv?utm_term=papago+on+android PDF link annotation
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/xoligegisivixibufasalup.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/rasupudibipemugunafoviw.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109100613469617.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/32659640570.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/86687209864.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/tufuverobenolizifibudulu.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/67605454207.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/93261539108.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/66041865738.pdfIn PDF document text
    • https://longhoang.vn/upload/files/37718304451.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/bamoliwotor.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/48558063869.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/58809583623.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/70319783606.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/89371487398.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/27256777950.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/4399290630.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/88492599507.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/rozilodokavumuva.pdfIn PDF document text
    • http://gibisch.org/files/files/39386036288.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/37913997139.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b5fdb385d7025dcb89318f5ecd291d8f/totiridun.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/kuwukenugowa.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD584 22200 bytes
SHA-256: 36633c64c5016c7737a812b614fcc9d0c6e056ce11d844e176e4eab8ad3989d4
font_01_sfnt_off00010ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED7 10124 bytes
SHA-256: 170fbc0c389daacd87c7c902e4e9fc9eac5e230168ba397644aaa1c862aedda1
font_02_sfnt_off0001252f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252F 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00012d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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