Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78cccb40cceb643…

MALICIOUS

PDF

87.1 KB Created: 2021-04-22 23:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ccb9ce49fcb21ec60834b9e3ebba275 SHA-1: 76158a27ba0b437cf2dee44ee2bb8e97636c0f30 SHA-256: b78cccb40cceb643bdfc208b18dee531d09687a6874ff9faa2dbf01ce983b6c7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains a large number of external links, suggesting a link farm designed to redirect users to potentially harmful content. The primary URL observed is https://zajinet.ru/strik?utm_term=luxpro+thermostat+psp511lca+battery+replacement, which is likely part of the malicious redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=luxpro+thermostat+psp511lca+battery+replacement
    • https://cdn.sqhk.co/gidulikegel/ejajjgc/51303183806.pdf
    • https://cdn.sqhk.co/rolaravez/ejdjjig/surviv._io_hacks_unblocked.pdf
    • https://cdn.sqhk.co/voxedifi/hjfL3gh/black_short_haircut_styles_2018.pdf
    • https://cdn.sqhk.co/tuwebobit/hjihfAM/75969302553.pdf
    • https://cdn.sqhk.co/vakenuda/jghMhbH/4_pics_1_word_level_2275_answer.pdf
    • https://cdn.sqhk.co/sifolilo/f2xiiiB/ximukepevuxolurum.pdf
    • https://cdn.sqhk.co/golemejexeno/ahbnuKM/40860728145.pdf
    • http://wunegaxuduru.22web.org/vumolapimiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dazusiv.epizy.com/5948599113.pdf
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_3a860642215c461b8c1f058e30dddb83.pdf?index=true
    • http://roruvavaderej.epizy.com/46399400286.pdf
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_7c8b623a6866418891700dfad252accd.pdf?index=true
    • http://wojobawezelo.rf.gd/chapter_14_interactions_in_ecosystems_study_guide.pdf
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_4015f6157bb941779725a7340dcc5153.pdf?index=true
    • http://povumuvepu.epizy.com/amenitendea_african_animation.pdf
    • https://uploads.strikinglycdn.com/files/58d0cc0c-d020-4e7d-94e2-9964b79aa546/66979333203.pdf
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_a54bb0fe871f4880830e53452895ebcc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6bed2edd-d32d-4c6f-bf44-dfb424474830/vepuwamuxu.pdf
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_c7307824b7e341baa57e0f6b5bf75100.pdf?index=true
    • https://uploads.strikinglycdn.com/files/16653082-cc1e-42a1-97d0-f8cf53c8dd5d/simiwisifon.pdf
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_807c4420dafc4c6fa16ae097aec8f240.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9629bf00-84df-40d2-ad59-edf05248966c/basic_english_conversation_daily_use_with_urdu.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_off00011332.bin
3bf84a8a3bc01a019c6ec27023df0e415aa266f10692a800860f5d5fe6083fe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 5600 bytes
font_01_sfnt_off0001262b.bin
111b96b19df4829be12bd1cb2e08d7307a2fdcaeccee9cd8fe866e671f68fd49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1262B 11600 bytes

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