Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9fd052afcf3fd0…

MALICIOUS

PDF

76.1 KB Created: 2021-03-31 02:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1241fbf0f1a7a739e237a77ef2d4cdd9 SHA-1: 7f3ebc5c77a2ff2238720315acdbcc571e166dd3 SHA-256: 8e9fd052afcf3fd04345d38c73ae0035444794832366f8ebbc416c7c24ce4977
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or using UTM parameters, indicating a link farm designed to direct users to potentially malicious content. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the nature of the link farm suggests it could be used for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://druttle.ru/123?utm_term=imperialism+map+questions+answer+key
    • https://cdn.sqhk.co/rajemaramiw/qjisO3I/91825657756.pdf
    • https://turazuxutanuv.weebly.com/uploads/1/3/1/6/131606798/muvimet_sajozej_guxuname.pdf
    • http://notalebapol.iblogger.org/samsung_hmx-f800_price.pdf
    • https://cdn.sqhk.co/mojupesonon/hjhidia/wekodaxosipiz.pdf
    • https://boretenewur.weebly.com/uploads/1/3/1/4/131453221/jasud.pdf
    • http://lamejix.scienceontheweb.net/zilufevapututigapex.pdf
    • https://kowirakixodoxe.weebly.com/uploads/1/3/4/4/134467502/7763828.pdf
    • https://cdn.sqhk.co/dagosasojo/giXvzhb/3282494235.pdf
    • http://fuzubijixulux.mygamesonline.org/abrsm_guitar_scales_and_arpeggios_grades_1_5.pdf
    • http://bimoriz.getenjoyment.net/what_do_rattlesnakes_symbolize.pdf
    • https://cdn.sqhk.co/fejumoraw/BigcijM/viber_for_samsung_galaxy_ace_s5830.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_36a001de0bbb41fd971cfad7beb16797.pdf?index=true
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_37fd46601c5349b6a01d3162aee6f5df.pdf?index=true
    • https://s3.amazonaws.com/mamibis/12360446326.pdf
    • https://s3.amazonaws.com/jefazaxal/22923650313.pdf
    • http://romofimor.onlinewebshop.net/file_tidak_bisa_dibuka_di_wa.pdf
    • http://kamaxunavag.epizy.com/soxofiwubemuvewesem.pdf
    • http://sekekubonigav.rf.gd/analytical_presentation_template.pdf
    • https://s3.amazonaws.com/satulibaren/calling_movie_audio_songs.pdf
    • http://guwaduroredidaj.rf.gd/lady_kenny_rogers_piano_sheet_music.pdf
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_a8e0c057914041df9e488e47ad51fd98.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_off0000ebe3.bin
77f5795b3b57ab724f63b0ae2de74767343c85d7226e454045fefbf9b644d8e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 5288 bytes
font_01_sfnt_off0000fde0.bin
2362d5e964a93851a43911788e1985a2ed268cf65ce8424ffc80b26ceb88fdec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 10936 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.