Malicious PDF — malware analysis report

Static analysis result for SHA-256 b140fff87d9c380a…

MALICIOUS

PDF

97.3 KB Created: 2021-04-08 05:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: aaffa1f8401ba848c8fdcd0af381b0e3 SHA-1: ca71d5a436b906bd0f9ec72262abb0843541c8a4 SHA-256: b140fff87d9c380a1832223acdb3b343fdd3603efaeb924329bafd6b45be5eb2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('soxebez.ru') that is flagged as external. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than being a legitimate document. The presence of multiple external links, some on disposable hosting, further supports a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://soxebez.ru/strik?utm_term=lexile+level+conversion+chart+to+fountas+and+pinnell PDF link annotation
    • http://rolapisi.scienceontheweb.net/what_are_the_four_steps_in_social_learning_theory_quizlet.pdfIn PDF document text
    • http://tavafotuzefox.sportsontheweb.net/kunosiv.pdfIn PDF document text
    • http://cardioactiveitalia.site/fraud_examiners_investigators_and_analystsypr7q.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/shark_ion_robot_r77_vacuum_reviewsafb33.pdfIn PDF document text
    • http://trynutra.shop/robadagixigaxemurotekv7r.pdfIn PDF document text
    • http://trysalon.xyz/6876345797920y9h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453108/normal_601f19c4b4a00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_5fe842e76da3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490516/normal_60159290c0825.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/legesiliv/vegetarian_cannibal_full_movie_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52bbf9cb-0a2d-4c63-8503-6528880b6325/netgear_wndr3700v2_repeater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c32443-85b1-476e-990f-44020c8cbd1a/how_to_crochet_a_quick_and_easy_throw_blanket.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/where_is_the_limit_switch_on_lennox_furnace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/036ec02f-6941-4bed-b330-8c66f3521264/nabitiwevafifesarej.pdfIn PDF document text
    • http://zuxokoberibaw.atwebpages.com/adelaide_city_map.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/how_to_do_self_portrait_photography.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/sea_of_thieves_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c53647f2-59bf-4bdd-bb10-18690f83377b/vimugojotarokegapuxuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf12540-0190-4cbc-ac7e-9fe098a0062f/19427159229.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
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA2 6832 bytes
SHA-256: 3c1499defb01d70bb2cd1a99f2187e9b55a53790071b73e60527571891b9895c
font_01_sfnt_off00011ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 5312 bytes
SHA-256: dddc811f2482fab1300747bc3ffe943aeee2d3336b817bd7b119e71a0a1a9660
font_02_sfnt_off00013106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13106 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_03_sfnt_off00013994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13994 11424 bytes
SHA-256: c94d095e1b7f449cee7b51298b06e3fb972153defc005ff73a19e408f176566c
font_04_sfnt_off000160af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160AF 16372 bytes
SHA-256: c161ca8da94011c75f3fb34345f250ad49708ad84f7afaf2c77ded18e80719ce

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