Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0c8f6b05ca1d7a…

MALICIOUS

PDF

96.7 KB Created: 2021-04-10 11:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f11c0bd2a10cabe90873720277d2398 SHA-1: a90cfe8758badfda17af57a852b0660b97570a68 SHA-256: 1d0c8f6b05ca1d7a354da608f84a85ff315e544b1f8bd8668e691c58e6db13c8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal a significant number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://xezojetit.ru/strik. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

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-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://xezojetit.ru/strik?utm_term=commonwealth+vs+hunt+significance
    • http://igafnd.org/mopavotoserolefozemobuwukm0kyu.pdf
    • http://islandlandscapesbb.com/free_android_file_transfer_app_for_windowszzy2t.pdf
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/2822608.pdf
    • http://ontrade.top/long_and_short_vowel_sounds_worksheeh65xy.pdf
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/3bf989d4663e0.pdf
    • http://zekagepalido.iblogger.org/forofoluj.pdf
    • https://woninulanomawij.weebly.com/uploads/1/3/4/6/134670754/tojefurovetaju-zimudop-taramuzig.pdf
    • https://tesegape.weebly.com/uploads/1/3/5/3/135387632/a70ab.pdf
    • https://tojuxumisadef.weebly.com/uploads/1/3/4/7/134714483/e3442.pdf
    • https://binemipo.weebly.com/uploads/1/3/0/8/130874238/sikanuverenekur_pidukuzan_tiwebefezasow.pdf
    • https://rifuxegu.weebly.com/uploads/1/3/4/5/134525143/edd09a.pdf
    • http://malegewetepi.22web.org/calf_muscle_strain_exercises.pdf
    • https://texoxarisozitew.weebly.com/uploads/1/3/0/9/130969357/zegugonije.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2c1a3b7d-6419-476c-a5ce-adcbfca5acd2/rib_tips_masterbuilt_electric_smoker.pdf
    • http://gufidom.rf.gd/numakugebaruvewiwadekuvi.pdf
    • https://66547991-fb4b-492c-b271-2b6457db34f0.filesusr.com/ugd/a98e70_945ac5f538c44f47adbaba7a8d1210a5.pdf?index=true
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_109268f7eb374a30a1056eaa49acbef3.pdf?index=true
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_d4b4cbee93834be281fab612a5870872.pdf?index=true
    • https://uploads.strikinglycdn.com/files/622280bb-709c-49bb-99dd-9ea64f958185/16773278147.pdf
    • http://xewebumobodoris.rf.gd/cbse_affiliation_guidelines.pdf
    • https://uploads.strikinglycdn.com/files/5e2f8a6e-3428-4fa9-906e-986cd024a611/51158989535.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_off00013b32.bin
e83582e83c4b0424d9947586df8d22c88c3f39d07cc5dff0eecf564b1e6f92ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B32 5256 bytes
font_01_sfnt_off00014d07.bin
7138c070df861f6985502465f4eda582069400008b9a1093c608bbf2a6cb526a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D07 11512 bytes

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