Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5b3da354031994…

MALICIOUS

PDF

82.1 KB Created: 2021-05-17 13:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 028396490f9e55332a53be8c56c5500f SHA-1: 4b85d7215b23c6822087217310fab572073f36ae SHA-256: 7a5b3da3540319943c46ba2aeac46ffd99f1f3c6708adca5180e7925e40d41ff
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The document body is heavily obfuscated, but the presence of 'Toro power clear 721 e manual' suggests a lure to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for traffic generation or potentially to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 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.
  • 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 http://womarerawona.iblogger.org/maxupusuxuzikug.pdf In PDF document text
    • http://zozegakipuvi.iblogger.org/derebajidikomerasulolef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/mO-5lVq97NI/wb?keyword=toro%20power%20clear%20721%20e%20manualPDF link annotation
    • http://malebowepapin.epizy.com/what_is_structural_framework_in_construction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8fe33c0-5935-4afa-8491-100b44530894/how_to_get_alexa_to_turn_on_roomba.pdfIn PDF document text
    • http://bizemilibudog.rf.gd/analytical_mechanics_fowles_and_cassiday.pdfIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_1c72d1317920437ba37837fdafb716ba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/640492ac-5cd8-444a-8948-e171fdde077c/avalon_vt_737_plugin_crack.pdfIn PDF document text
    • https://0f939073-77d1-4307-aaa8-42539c8515e3.filesusr.com/ugd/85c9df_26de9dbdcc314b9eb5887580636d56f9.pdf?index=trueIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_1270e4949ab84e58a940b93e7f81a7a5.pdf?index=trueIn PDF document text
    • https://3211d54f-29bc-45c2-8691-939fa64f7450.filesusr.com/ugd/2e34c2_ff9aeb3307384d6a827a81623a09d2ef.pdf?index=trueIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_514f4a63dc5b4eee94019bcd2cebfc43.pdf?index=trueIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_8c4bcb45898b4925adf9cd7d8578b39d.pdf?index=trueIn PDF document text
    • http://nexopuvesoreben.epizy.com/kelipivideri.pdfIn PDF document text
    • http://nunusama.rf.gd/54459385188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b90b62ea-d62f-4ead-a66b-367fa0ec8550/16550286706.pdfIn PDF document text
    • http://gevalej.epizy.com/best_telugu_movies_2019.pdfIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_9fe3bfafb4814e578608739336a883f8.pdf?index=trueIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_ad145e4f7c60401a816836c62d76d99b.pdf?index=trueIn PDF document text
    • https://e2a3f85e-3ce8-4c76-99a2-e63219cad5ad.filesusr.com/ugd/473d25_fffe8bb844554a4fa97f3b965d6ccc85.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_26f78914b2ab4d2087b07e2c2dee086b.pdf?index=trueIn PDF document text
    • http://dorowoz.rf.gd/archlinux_installation_guide_virtualbox.pdfIn PDF document text
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_9dd885345e8e454ead43832527a82975.pdf?index=trueIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_401eaf3cfa064195822fb0e3b7e6a9b7.pdf?index=trueIn 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_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 5208 bytes
SHA-256: 3d784f212a999b7116264d447c4a15465117ba892f117cdcfe80fc5b12ade8d5
font_01_sfnt_off00011295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 11900 bytes
SHA-256: bec672a02dcf859c0658bd108b39b6d2a11b0ecc9e946629fbdd649f5eee8689

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