Malicious PDF — malware analysis report

Static analysis result for SHA-256 f357655da83a1b0d…

MALICIOUS

PDF

101.8 KB Created: 2021-03-28 19:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bb3545f50cc359f64930cac58682ee9 SHA-1: ab491a875c7a6c99030e5048c83cc032c4053784 SHA-256: f357655da83a1b0de8a35a6cbbba614511ddad92aa76f57ca0dca7e298ed07ae
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic identifying it as a link farm. The document body, though heavily obfuscated, contains text related to 'exam schedule', suggesting a lure. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malicious sites for SEO spam or phishing.

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-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://nipisod.ru/wix?keyword=ib+exam+schedule+2020+november
    • https://cdn.sqhk.co/sifajoxojif/Qjchixi/download_meltdown_premium_apk.pdf
    • https://gafewifem.weebly.com/uploads/1/3/1/3/131379815/fuwadirujebo-midemu.pdf
    • https://zodixezujiz.weebly.com/uploads/1/3/5/3/135345824/koluweteb_vazuwo_japadiw.pdf
    • http://meetporte.xyz/46766949080z5zex.pdf
    • https://latitatuforuza.weebly.com/uploads/1/3/1/3/131398212/1177269.pdf
    • https://cdn.sqhk.co/kisereta/dowjfB5/pepezu.pdf
    • http://8gusevshop.space/blocky_cars_pcs4d6v.pdf
    • http://daliadiago.com/wumiwataforagabitabetyj9l1.pdf
    • https://cdn.sqhk.co/raxodinako/femGwif/11360993816.pdf
    • http://coolstudent.space/53197151324fkgpp.pdf
    • https://cdn.sqhk.co/seworani/hdjcij4/67087150744.pdf
    • http://thecet.xyz/vodijugutijujemewunuzoue9uu.pdf
    • https://cdn.sqhk.co/xiladuxe/Sgdgfwa/86409632878.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1384bccf-66ac-477c-883b-1e03c516b4de/toro_20339_oil_capacity.pdf
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_bb4d15b8bf044659836b09d985da0f35.pdf?index=true
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_deca3d986b0d479d8c7a1411789e82b7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a2397f24-e983-445a-bbf2-b68c021e76d1/how_to_program_dish_wally_remote_to_tv.pdf
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_e778f3cfaf194b46a776589a440ca862.pdf?index=true
    • https://uploads.strikinglycdn.com/files/986fa84e-71ed-4143-ae06-3ffd73e07682/sharp_xe-a102_manual_uk.pdf
    • https://uploads.strikinglycdn.com/files/b0e82386-69b1-4e27-aaa9-29c5d6dcbc68/superman_and_me_sherman_alexie_analysis.pdf
    • https://uploads.strikinglycdn.com/files/551ef818-091f-4981-99df-330d2ea4544d/jumbo_universal_remote_control_61959_manual.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_off00014a39.bin
c91c3c942fc4015972d651f5e2d5290ee4d079fb83efc6cc847f4b509d4a5c55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A39 5656 bytes
font_01_sfnt_off00015d52.bin
51f018712ad595454a4b2e8261d3f3b2770010ec5d08ea6ef2f35adbab1ff373		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D52 12868 bytes

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