Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a18fc39257d143c…

MALICIOUS

PDF

67.2 KB Created: 2021-04-06 17:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 786036cf08b3cffe0be69f9a2e72e892 SHA-1: 989b864558a028eecbcb9d664a8f4602a947ec46 SHA-256: 9a18fc39257d143cdd69116bb08ae84e2f8ef8758872b9e5a3d23feb3aa3ad64
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains references to search keywords and application metadata, indicating an attempt to appear legitimate while hosting malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/wix?keyword=craigslist+sarasota+bradenton+used+furniture+by+owner PDF link annotation
    • http://haustova.com/corona_kerosene_heater_sx-b21a_manualed2hn.pdfIn PDF document text
    • https://vulefinan.weebly.com/uploads/1/3/2/6/132695887/573678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451353/normal_6019f47d91c0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425214/normal_602c991705d8b.pdfIn PDF document text
    • http://wipogavor.iblogger.org/back_to_back_drawing_activity_templates.pdfIn PDF document text
    • https://magagitu.weebly.com/uploads/1/3/5/9/135959352/826a8f.pdfIn PDF document text
    • http://prizinsta.online/the_trial_of_spongebob_squarepants_who_killed_mr_krabsgi8af.pdfIn PDF document text
    • http://contact-git.top/fixaketenatimiretimukipu56dpf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448995/normal_602e30a5ed16b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464314/normal_605a0e87c33e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_781b1d0789f54e79a8af2bb608381bee.pdf?index=trueIn PDF document text
    • http://vevurikadi.epizy.com/zafotezaruzodiwe.pdfIn PDF document text
    • https://a26b494c-4f54-4b9d-aaa3-e02d462d315a.filesusr.com/ugd/c6268f_fb061c71330f41ed8b1a8d8a4453789a.pdf?index=trueIn PDF document text
    • http://jituriz.epizy.com/absite_review_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18906c30-e90f-431b-af50-3ad6ac74312e/love_story_song_movie_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d92b20ba-c106-4f03-a556-55492ad6e9c9/what_does_a_safety_engineer_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71694b3e-2935-4f4c-a0a0-7846e5431d60/element_60_inch_tv_1080p.pdfIn PDF document text
    • http://fodakobenolam.rf.gd/13488258918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/138a3618-2c29-496d-bbaa-017f0b19d692/hacking_exposed_computer_forensics_second_edition.pdfIn PDF document text
    • http://mimojududike.epizy.com/browser_android_tv_box.pdfIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_5f6b43f250884ed882dd7c1533b5445a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e207eb1f-2e34-4210-82e1-7c1cf5a1b300/ssis_package_tutorial_for_beginners.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_off0000c941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC941 5312 bytes
SHA-256: e40d6609f6ee9fc47367c2eebfce43d78c641cadbd6afcb7a569d45e7ef16d68
font_01_sfnt_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 9876 bytes
SHA-256: 4c4ed045edb76a2bf62f1b826f54b4243eef99f2c9aaba33942402e1308f93ae

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