Malicious PDF — malware analysis report

Static analysis result for SHA-256 c223a29335ee4c76…

MALICIOUS

PDF

100.5 KB Created: 2021-05-03 16:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2a05d5b1c040d278c7a5d560e1397214 SHA-1: 23f42561b386ad8d3c2d33b4a362b1713068226b SHA-256: c223a29335ee4c769ea5bd4475fc0dab15ecfba861410390d1fd73b81f8d158b
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF file contains heuristics indicating it is a phishing document and employs social engineering tactics like 'ClickFix' to lure users into executing commands. It also includes a large number of external links, suggesting a link farm for SEO poisoning or redirection. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature. The primary intent appears to be tricking the user into running a command that would likely download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://jumiwimov.ru/strik?utm_term=windows+10+ctrl+commands PDF link annotation
    • https://divamokavagi.weebly.com/uploads/1/3/4/8/134871471/3778044.pdfIn PDF document text
    • https://rumuzejisu.weebly.com/uploads/1/3/5/3/135349165/d95155879cc0313.pdfIn PDF document text
    • https://vogifidawavuda.weebly.com/uploads/1/3/1/6/131636702/mizosorufigi.pdfIn PDF document text
    • https://jakuxibakamu.weebly.com/uploads/1/3/1/4/131407414/658667.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/afd9b83e-1821-4614-9a96-84b8b251f92b/99409464175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a3a8b9-b596-4aed-891e-0a5eb986eb4d/61942680225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c32880ad-0f9d-4084-a5bd-5da0dfb7a34d/vedas.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/tv_channels_app_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/general_knowledge_test_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/skin_arteriovenous_malformation_pathology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dfd1e22-5779-431a-8510-79226c5a1701/personal_math_trainer_evaluate_homework_and_practice_answers_algebra_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7590b0d-e84c-489c-922a-29b37afa1fee/which_water_softener_salt_is_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c57b5f8-2215-44a1-be55-74a7272f5865/nitepidojusesefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ba94b4-b37f-4e34-9baf-01bf105b9b27/maytag_dishwasher_troubleshooting_no_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe573ae-2ed5-4c58-bff1-1270e3b55e2d/wahls_protocol_recipes_breakfast.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/2775299337.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/essential_project_management_skills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32fd17a6-4fdd-46b8-8710-908fdb1bb82d/56202048151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64722b31-f74d-4898-a90e-bcd0879de6ca/artculo_49_de_la_constitucin_mexicana_resumido.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E38 5384 bytes
SHA-256: 62894d07d7ffd33f6a37ef126a92e68df8df25055870f42b7ed163021c2260fd
font_01_sfnt_off0001408b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408B 12316 bytes
SHA-256: c4fa535f52943d606afba67dafb2a40ce049ef6c1499c6154f645d1d0ef9e17a
font_02_sfnt_off00016a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A7A 17632 bytes
SHA-256: 1b4fdd57a1dae49e7c9676205316a0eb34ed71d67190a21a333920f1a56e1559