Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4ad5a3d5f039a5…

MALICIOUS

PDF

75.7 KB Created: 2021-04-03 20:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 415fe22b7ac629f4ee414720c65c3fa6 SHA-1: b99326999accc30021437f99e633a742557cd15b SHA-256: 4b4ad5a3d5f039a55624036f40bdcb6b5b0cb161f90bddcd540c5e887bd87446
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 of which are to SEO-optimized PDF files, indicating a link farm or content-spinning operation. One of the primary external URIs, 'https://resalured.ru/strik?utm_term=2007+chevy+silverado+owners+manual+pdf', suggests a lure to download potentially malicious content disguised as a vehicle manual. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://resalured.ru/strik?utm_term=2007+chevy+silverado+owners+manual+pdf
    • http://ompala.store/retetomavok39jmk.pdf
    • https://cdn.sqhk.co/lazuxorus/dujiJjf/30991773381.pdf
    • http://spoonnumberone.xyz/convert_your_vce_file_to_onlinejhl7v.pdf
    • http://alifan.store/spongebob_sponge_on_the_run_netflix_release_date7lejn.pdf
    • https://cdn.sqhk.co/kekotenonaxu/jejj9he/13254733549.pdf
    • http://itawomen.fun/738274802550czet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bec81d4a-7068-4c1f-a581-ed0d28b7e6ff/minolta_srt_102_lens_mount.pdf
    • http://duxepivol.myartsonline.com/xenowedubudu.pdf
    • https://uploads.strikinglycdn.com/files/686ded6d-fb93-437a-aab3-be20ed1455c6/bissell_power_steamer_instructions.pdf
    • https://uploads.strikinglycdn.com/files/14a5e87d-1525-4777-ab67-88e351444528/48735225950.pdf
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_4a6e8091c02f46aa99d242d162393248.pdf?index=true
    • https://uploads.strikinglycdn.com/files/98182b07-23bd-4930-8cf1-2281cbd3f87d/ribim.pdf
    • https://uploads.strikinglycdn.com/files/29dce475-8802-4268-a325-de37a2763ecb/mastering_python_for_data_science_github.pdf
    • http://zujakogi.onlinewebshop.net/risc_v_instruction_set.pdf
    • http://milebulijulami.onlinewebshop.net/49777498470.pdf
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_e0f22e3cbc7a47c08f28e3156c6ee65c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a61125ac-0888-418e-9e1a-6b1344a465fb/second_order_partial_derivatives_chain_rule_examples.pdf
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_b74b4e2cf064486c8d40bc13b27921fb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/943cf425-4480-436b-b078-72a18236b8a3/bupitusafegawap.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_off0000e88b.bin
7815f46e933e7307565b65547bb4d3939362266fc41cfef986b59f46c6d0167e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE88B 5908 bytes
font_01_sfnt_off0000fca4.bin
5e77bba71913aefa20f8421f728d4661c0c47f9e8c5d2d1e332121090fb08d81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 10800 bytes

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