Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a75de884ac84d4…

MALICIOUS

PDF

72.8 KB Created: 2021-03-19 23:10:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2be7b8c3a1378f5a3493b64f3fb592f3 SHA-1: a9e51862bf20da526610834477f885573b2ffed2 SHA-256: 07a75de884ac84d41dab26ac51a631a822bca39850724a595c9ae870f26a0bc9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and directing users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs suggest an attempt to drive traffic to potentially compromised or malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=molarity+of+solutions+worksheet
    • http://xasowokudat.medianewsonline.com/most_accurate_blood_pressure_monitor_wrist_or_arm.pdf
    • http://mmeueue.space/53926345100smvok.pdf
    • http://kieverts.xyz/setogevojitowanevojafosotomjo4.pdf
    • http://wunadimizurened.medianewsonline.com/convert_file_to_microsoft_word_document.pdf
    • http://tamakar.tech/background_reading_mathematical_thinkingrnfu3.pdf
    • http://meinekarten.best/gawokonagixogaxowcmhoh.pdf
    • http://uabiomanix.xyz/macbeth_freekph9p.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_ae0a3e16e0e34cc39e28e1fc1369ca60.pdf?index=true
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_25e75e81d58045dea6ec6729b9f46dcc.pdf?index=true
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_369dc396546348c5998b74fe45c6372a.pdf?index=true
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_dd0173a341934c1293c192ba2ba2e78b.pdf?index=true
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_923fb6da07894dea8ed0fbeb703602fe.pdf?index=true
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_6d0d62765d35487d908406f5ff1259ea.pdf?index=true
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_2eb78f3f823b4f269dce9c4df5ae13dd.pdf?index=true
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_06965cb13ab0437bbef9a0de9755667b.pdf?index=true
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_345f8777508f4da382c8274f7406695a.pdf?index=true
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_4979cea73f6a443abfd263f29dfcab7c.pdf?index=true
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_1dfdc9ed93d949fba9d77d14aecea1c2.pdf?index=true
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_08c3990477834e7eb0d11c7098d5af2d.pdf?index=true
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_b4c42e89627c406492fc00bafd3e196a.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d374.bin
387a46151a37a0001bc224bcece3ddfaee9982da9309eafa7f930a2c1cb7b342		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD374 5000 bytes
font_01_sfnt_off0000e486.bin
26fbe85f684a2960b5a9e756bd5e6e671f111fafb46104589067de962c107e8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 10708 bytes
font_02_sfnt_off00010816.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10816 4324 bytes

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