Malicious PDF — malware analysis report

Static analysis result for SHA-256 5357b22486b28bea…

MALICIOUS

PDF

88.4 KB Created: 2021-06-03 06:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 11c61eb72727f9dd6720de0c9a6d4e61 SHA-1: 03d630927735660f003ab4a5262d8c7da27314dc SHA-256: 5357b22486b28beab56904c6c9f913c4de02911ccbbfd3beec8179ebf8bb2383
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a link farm, with numerous external links pointing to disposable hosting. The document body, though heavily obfuscated, contains lures related to remote support tools, suggesting an attempt to trick the user into installing malicious software. The presence of embedded URLs and the overall structure indicate a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://gimoguvi.ru/123?utm_term=medical+bacteriology+notes+pdf PDF link annotation
    • https://tujowijide.weebly.com/uploads/1/3/0/9/130969571/kakemajilo-munidolisuzur-gedabojes-kawupuzarinizos.pdfIn PDF document text
    • https://jetasiduneka.weebly.com/uploads/1/3/4/5/134586997/piziwuvoso.pdfIn PDF document text
    • https://sajenaviwabawi.weebly.com/uploads/1/3/4/2/134266368/lumukegejuwuke-junijodofalit.pdfIn PDF document text
    • https://pijuzuzubafewo.weebly.com/uploads/1/3/2/6/132695302/rexeridupolexis-ziwuju-wararebenozina.pdfIn PDF document text
    • https://dinoromakutaxe.weebly.com/uploads/1/3/4/4/134479472/9072fb7093e2111.pdfIn PDF document text
    • https://bugupogif.weebly.com/uploads/1/3/4/7/134766918/8c201cbd173c91.pdfIn PDF document text
    • https://momapepax.weebly.com/uploads/1/3/4/5/134594639/kuxunewaluf.pdfIn PDF document text
    • https://kelonefak.weebly.com/uploads/1/3/2/6/132683111/6ccf385e1760.pdfIn PDF document text
    • https://fikepeti.weebly.com/uploads/1/3/4/4/134489659/529516.pdfIn PDF document text
    • https://bavimukirisami.weebly.com/uploads/1/3/1/4/131482950/zapiwigutedasakom.pdfIn PDF document text
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/sajarunezikefimixuvo.pdfIn PDF document text
    • https://vamexerop.weebly.com/uploads/1/3/6/0/136085595/mejasofurudaw.pdfIn PDF document text
    • https://zisifogadudup.weebly.com/uploads/1/3/4/7/134765868/vikiruti.pdfIn PDF document text
    • https://xutifapob.weebly.com/uploads/1/3/2/7/132712150/5835683.pdfIn PDF document text
    • https://kesesitevon.weebly.com/uploads/1/3/5/3/135317357/8416146.pdfIn PDF document text
    • https://wagelefukat.weebly.com/uploads/1/3/4/2/134265927/pazij.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/cda502.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2d06a97-3f1b-40d6-bb34-8f9cbd84442e/how_to_do_order_of_operations_with_square_roots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00216f71-5230-4317-be6a-2046de4183c0/predictions_of_2021_year.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9ea70b-aa28-4cf4-a29b-bc4d0a4c62c5/28696318915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31385b38-3a14-4473-8411-84c610611bc6/teamviewer_11_free_download_for_mac_os_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f41018-1c03-4fe5-ab41-7bb23129f42f/which_of_the_following_is_an_example_of_direct_address_in_a_film.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C00 5568 bytes
SHA-256: 3e966f227030dfd4306683f2e823101e03881cf1ff3b070b8c419a5432898e2d
font_01_sfnt_off00012f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0C 10972 bytes
SHA-256: 29233963f545f16de7763a1b5e8c07835df41ed3460b765df5f669424a5b8a7e

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