Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6c8ea15ef5b6aa…

MALICIOUS

PDF

78.7 KB Created: 2021-03-15 00:39:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ad82cadcbefd7eaaf6f259f625ffcb9 SHA-1: 19238d3f051b720af5b38c44ac36775e324bd61d SHA-256: 0a6c8ea15ef5b6aa6cb7c9bdd6e2ad1170240570d3720eeea4adc1be58a8d3db
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external links, including one to 'soxebez.ru', suggesting a phishing or link-farming attempt. The document body, though heavily obfuscated, appears to be a lure related to a 'California residential purchase agreement'. The presence of embedded URLs and the overall structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/wix?keyword=california+residential+purchase+agreement+explained
    • https://cdn.sqhk.co/zinazejoras/3OzijSi/fancy_names_for_cats_male.pdf
    • https://cdn.sqhk.co/gulanuwe/Kih5ihQ/potivuvixom.pdf
    • https://cdn.sqhk.co/zipuzedozame/gg6hage/lafab.pdf
    • https://cdn.sqhk.co/wafasojudo/hdgj8mi/braiding_sweetgrass.pdf
    • https://cdn.sqhk.co/pufowuvikij/mH248if/dmv_license_plate_number_lookup.pdf
    • https://cdn.sqhk.co/nuwezomu/70gegh6/wezevoxetomilewif.pdf
    • http://wewazer.iblogger.org/stewart_redlin_watson_precalculus_7th_edition.pdf
    • https://cdn.sqhk.co/zekuxemelop/ohbgmhh/little_alchemy_game_online.pdf
    • https://cdn.sqhk.co/zodunoxurob/Qihe3hg/54397191962.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7d14b3fe-44ab-47f5-a5a4-fb5d7998febd.filesusr.com/ugd/ba499c_b81fee6dad28429dabb0fbbb47f2b580.pdf?index=true
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_fa31d89825a34c118c4aa98a48b0f366.pdf?index=true
    • http://xelezunulusa.rf.gd/wunipuxisixozewaderize.pdf
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_1faf61551df9445781266e3d1a114dfe.pdf?index=true
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_a212356e431e49c98be619af3510a10d.pdf?index=true
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_a93d033fc7c149b2956960d4c913d6a5.pdf?index=true
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_dd69f67aafa94093aaf67183f3516644.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d550529f-ea5e-442c-a04d-4ea033cf5dc3/68284394790.pdf
    • http://lenixad.epizy.com/agyaat_2_full_movie_720p.pdf
    • https://uploads.strikinglycdn.com/files/b55f1fd7-500a-432a-a445-057153cade1c/sons_and_lovers_book_summary.pdf
    • https://uploads.strikinglycdn.com/files/95c07f89-dc42-429c-97ea-ed1512588723/las_batallas_en_el_desierto_personajes_principales.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f517.bin
d3e02b91b9663028e594bf213e800d49d2cf62eef91f527d9487c0eee1bb2e4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 5540 bytes
font_01_sfnt_off000107cd.bin
8d373f4ea2170111903296e144522c4ce3ec4a4a2ea669070fcad065de631e69
pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 10828 bytes