Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e9d7f4e78fda4a…

MALICIOUS

PDF

82.1 KB Created: 2020-11-13 23:14:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c98b0e5e7f5986604ccaf2772b1f03d SHA-1: 14402150bbff09f0ac4febe3dd505497c3fc6a89 SHA-256: e9e9d7f4e78fda4a10be68f4526f3dd2a7a4efeab2ee5d0deea82cbd070ef631
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/123?utm_term=probability+problems+with+solutions+pdf+download
    • https://misopiwulasi.weebly.com/uploads/1/3/1/8/131856666/c8303b684.pdf
    • https://tufiganifipira.weebly.com/uploads/1/3/4/3/134310976/nenejowukep.pdf
    • https://tatudikugox.weebly.com/uploads/1/3/4/7/134738012/2278423.pdf
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/a45e495055f.pdf
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/xozega.pdf
    • https://voberugupov.weebly.com/uploads/1/3/4/4/134496708/41ce4f466dabe8e.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pukiza/fesatafigajejebur.pdf
    • https://s3.amazonaws.com/zetubakuz/power_wheels_cadillac_escalade_owners_manual.pdf
    • https://s3.amazonaws.com/lodunixodetum/babusan_mohanty_all_songs.pdf
    • https://s3.amazonaws.com/nitidadufetenu/tamil_serials_247.pdf
    • https://uploads.strikinglycdn.com/files/09f9bff0-0edf-4def-8adb-6788eb6a9d7f/jepulitokevovidositoxu.pdf
    • https://s3.amazonaws.com/megulu/65835940676.pdf
    • https://s3.amazonaws.com/waxapoz/download_ps3_games_reddit.pdf
    • https://uploads.strikinglycdn.com/files/1c12adc5-95e1-4dbe-9a7e-5f48fe526600/thich_nhat_hanh_death_date.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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000dd50.bin
1905f73e3ebe9d53d69e20a456b4f51c3e3068e61b773518d76eb02e5054aa50		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDD50 11952 bytes
font_00_sfnt_off0000ca60.bin
5418324957781c524776cd1a9eb566d56ff6c1381472bcc1e20fc53d2f015b24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA60 5616 bytes
font_02_sfnt_off0000ff94.bin
77235e265d0938d3d22fcf67ddbe2a592f7502c3eb3ac169c844d5fce9190057		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF94 11128 bytes
font_03_sfnt_off00012574.bin
3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 16096 bytes

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