Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e655fd187f78d9…

MALICIOUS

PDF

87.9 KB Created: 2021-05-03 20:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34413a5c33a224e159aa1455df7c83dc SHA-1: 99364514a13821d36bb52043803c26029ef9523c SHA-256: 86e655fd187f78d923075501caaae280311eaf53c07e7c70c872e6f830811507
126 Risk Score

Malware Insights

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

This PDF document was identified as malicious by an ML classifier. It contains a large number of external links, many of which are on disposable hosting and use UTM parameters, suggesting a link farm or SEO manipulation tactic. One of the primary external links points to a URL that appears to be a lure for a tutorial. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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 https://vilenefex.ru/strik?utm_term=soap+web+services+tutorial+by+durga
    • https://puzifisabu.weebly.com/uploads/1/3/1/3/131378936/sewopomanurewob.pdf
    • http://medyahanem.com/5729953383tlq3w.pdf
    • http://sabumow.mygamesonline.org/57579415802.pdf
    • http://copyrightreports.com/android_capture_back_button_pressbfw6d.pdf
    • https://kirofiwesufeziw.weebly.com/uploads/1/3/4/8/134846910/2f7b54d17ecdba8.pdf
    • http://zoxuruje.sportsontheweb.net/60790031116.pdf
    • https://rasizuxuner.weebly.com/uploads/1/3/1/3/131378923/4762190.pdf
    • https://padixegidenu.weebly.com/uploads/1/3/1/1/131164435/44aa9b5d.pdf
    • https://tomosuboma.weebly.com/uploads/1/3/5/3/135382902/riduvowid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_f8450ec5204d4621bef6639b931b3819.pdf?index=true
    • http://kawerulim.onlinewebshop.net/30th_birthday_party_checklist.pdf
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_ba1bce7baea8499d8099de2ce28174e2.pdf?index=true
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_4a67829934254a8e91c1fe1a4fa8c003.pdf?index=true
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_8946e46455a54bf6a1cb25771873a89c.pdf?index=true
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_e66aea4b4dd846e9934f93762656db3d.pdf?index=true
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_a93024a3995f41c196f10548d7a0fdd7.pdf?index=true
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_1a8f4026e6414b38b86d76acf1d9e21a.pdf?index=true
    • https://976edc35-935c-46de-9e6e-e225dbc25668.filesusr.com/ugd/0829d8_710f6fd3004b409d84586102cde8af6e.pdf?index=true
    • https://e2a12503-e9f4-4898-9b1e-00959bf5a9c8.filesusr.com/ugd/1f0de7_dfe7f52433564bf2b4a0a80d57b0495b.pdf?index=true
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_752cd6a848b642dda79da6b79623a9be.pdf?index=true
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_fe4fb6e2ed0c4167a39063096f135aa0.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f60a.bin
5d99e1711d3de95e7bc5b4bfa6fad1f2d35232ca069569bc9398b0ab8fac6b3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 5740 bytes
font_01_sfnt_off000109ab.bin
349302e5166489e709894d250cb302ea811599ffbef87cbeee8ddb76a38656c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109AB 2044 bytes
font_02_sfnt_off0001133a.bin
a0c8bd69ad6e8912593ee62baf90e70d46e1a88e4ddc66df49b3830f21adb6e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1133A 11944 bytes
font_03_sfnt_off00013c1a.bin
f726a2acfcc4c9ea1fa8beaf15a361c4f599e91333fb30a1b3bc89b3f767a1b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1A 16172 bytes

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