Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fc1758c2c7615d…

MALICIOUS

PDF

76.1 KB Created: 2021-04-03 15:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a8368b8c94d54acac1c8090eedbd0842 SHA-1: 11d1f6f03308a6c7868d336e9031e9c33351dab8 SHA-256: a6fc1758c2c7615d804895046d495f4453d6641c77e31bace86882f465beecc7
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ponafet.ru/award?keyword=irish+horse+racing+fixtures+2020+pdf PDF link annotation
    • http://wekeb.space/bogutoluhp4sl.pdfIn PDF document text
    • http://supportcopyright.net/don_juan_mexican_restaurant_kernersvilleoy3i7.pdfIn PDF document text
    • http://zeridojatis.iblogger.org/yamaha_motif_xf8_88-key_synthesizer_workstation.pdfIn PDF document text
    • http://kittyplay.online/luvadovow5zbfp.pdfIn PDF document text
    • http://tamowigaxijatot.66ghz.com/92086252826.pdfIn PDF document text
    • http://xubaseki.iblogger.org/good_morning_ka_photo_free.pdfIn PDF document text
    • http://persequen.com/22252266157tva0s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nimetegukixiz.rf.gd/dasitulabe.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/molosupuv.pdfIn PDF document text
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_2f73858935dc470385f0322d686fac8f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/39236725990.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/sefotivinikesumubo.pdfIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_e1196133ee9d4845853185c1409a8545.pdf?index=trueIn PDF document text
    • http://zodesozagusi.rf.gd/xosidofopototodad.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_492da04423b346a0ae3e95e00a086a09.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zalomi/diary_of_a_wimpy_kid_movie_online_fmovies.pdfIn PDF document text
    • https://3ea853e4-7f2b-4fb0-9229-b04907a1e321.filesusr.com/ugd/d94095_a1121f76b5054ec3a6699e373b8edf4d.pdf?index=trueIn PDF document text
    • http://tukudapig.epizy.com/12631472937.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/blaggers_guide_to_book.pdfIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_39c7968773f14d7997a430f0756ee010.pdf?index=trueIn PDF document text
    • http://seguwogira.rf.gd/94046170433.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 5664 bytes
SHA-256: 30698fd53c5df5e11f2ebb595fdee12b0e4261eb61185ac635886494c33eaa42
font_01_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 11452 bytes
SHA-256: 31d3e65b09f6afaa20cc8d3e98607170ad11efab48cf146479234b1df600e796

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