Malicious PDF — malware analysis report

Static analysis result for SHA-256 274bc7426fb94aec…

MALICIOUS

PDF

88.4 KB Created: 2021-03-16 04:31:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b07771fa8341769ee50a4e8d370a6610 SHA-1: 1f38eb191632e72668d75e3e16c6e8d4f8cf33ba SHA-256: 274bc7426fb94aec2465ef0793a8a574993777797235b30c54e1a1ed6d3488ab
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL heuristics point towards a phishing attack leveraging a seemingly innocuous document title to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://leonvi.ru/award?keyword=conditional+operator+in+c+example+pdf PDF link annotation
    • http://pycnidwzxc.info/pablo_neruda_poems_about_friendshipux3u1.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/edtpa_task_3_assessment_commentary_examples_elementary_math1zdo7.pdfIn PDF document text
    • http://letgtma.bid/boy_scouts_lawsuit_opens_secret_filespb5r9.pdfIn PDF document text
    • http://levelupguild.com/panosigepoxalj7i1.pdfIn PDF document text
    • http://salea.site/ge_eterna_series_refrigerator_water_filter1gxb9.pdfIn PDF document text
    • https://cdn.sqhk.co/fikubife/hgihejf/gajokusubolerodugog.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/12448908898t49n7.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/Uhiid0C/56034005157.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_371d67051107432fb76d77a0c19d855f.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_1f24a7a77ec041e695deeabbc1b9e80e.pdf?index=trueIn PDF document text
    • http://tepiwoz.epizy.com/69680506981.pdfIn PDF document text
    • http://buzezasafez.epizy.com/55767950943.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/clubbers_guide_spring_2009.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/4817713537.pdfIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_13c02d41e6214835b3612b8406648101.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/sujirelagatovap.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/zinulavododojew.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/3_words_8_letters_say_it_and_im_yours_episode.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 5096 bytes
SHA-256: 2e824e5b7d3ac68892fd278b008cc848ce15bf3ef7ebb27c21827385fd118db2
font_01_sfnt_off00010321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 6568 bytes
SHA-256: 65705ca41c3cda7754718dae52e1ae623a5fda6812178510b36954643bfee1ee
font_02_sfnt_off00011363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11363 12004 bytes
SHA-256: b202dc68c9641f5170e2c357b1f9fb9e0876a6a12130e1caaa44cf1527c9a044
font_03_sfnt_off00013c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9E 16176 bytes
SHA-256: 9d4f82974968f0014e22e5e6ccfbfce66cd707407243f3b094479b1a1f5ce0a0

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