Malicious PDF — malware analysis report

Static analysis result for SHA-256 22fba4107254dd3c…

MALICIOUS

PDF

83.3 KB Created: 2021-03-22 12:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 168fe9ddba917948caae3364c4e69703 SHA-1: 2b8fc846695545c39827dcec956f251b8beddaff SHA-256: 22fba4107254dd3c204b967f721b465b27fe1283ab4646b8014235f1cdd4eaee
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating a large number of external links, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no explicit script was found, the PDF structure and embedded URLs point towards a phishing or malicious redirection scheme.

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://druttle.ru/aws?utm_term=rhonda+byrne+the+secret+book+series
    • https://static.s123-cdn-static.com/uploads/4491969/normal_6001c00b3ce3f.pdf
    • https://static.s123-cdn-static.com/uploads/4369930/normal_5fe3624c97998.pdf
    • http://rutonujak.iblogger.org/difav.pdf
    • https://cdn-cms.f-static.net/uploads/4390995/normal_600ab0c9472e1.pdf
    • https://cdn-cms.f-static.net/uploads/4485440/normal_602aedad70e03.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gusule/kepoluvejiregowowawa.pdf
    • https://s3.amazonaws.com/mujesogi/que_simboliza_el_arcoiris_en_la_biblia.pdf
    • http://jopatodorijapu.epizy.com/nedukatokivagegenibebilip.pdf
    • https://s3.amazonaws.com/wexukufedepim/ics_214_form_word.pdf
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_67bb55d8ace6459ca86efe7a78dc1592.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6b7e95c3-761c-4c8f-b4f0-d2fd8fc9bb49/las_guerras_carlistas_ebay.pdf
    • https://uploads.strikinglycdn.com/files/46589997-952a-4fec-8cf9-ba9b655df0e7/how_to_write_a_description_ks2.pdf
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_67777137f46649799ffb571c79e40ff1.pdf?index=true
    • https://s3.amazonaws.com/salosibejodod/60978416178.pdf
    • https://s3.amazonaws.com/runuzitexokol/blockchain_applications_hands_on_approach.pdf
    • https://s3.amazonaws.com/wekibik/11124657809.pdf
    • https://uploads.strikinglycdn.com/files/a40b12d3-56fe-4290-bd8a-27d63001c94f/vufubosopijutumagusafo.pdf
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_6053cf4943224137a48efe2f9702c0c6.pdf?index=true
    • https://s3.amazonaws.com/kakef/hyperkalaemia_guidelines_cks.pdf
    • https://75edee45-cd08-43cb-a752-0c33e5c2343f.filesusr.com/ugd/a7c173_9dd415cf26c248b6954e17a602c8045c.pdf?index=true
    • https://s3.amazonaws.com/vofadoloves/vector_brochures_templates_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a4.bin
20319af297baa7b68d7b4bc1be1198e1ad764927ae3b4841113c5a1994deb74d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 5096 bytes
font_01_sfnt_off00010aeb.bin
9e637935df6789caa90712e319c9380b70e7e5d76e6dd81aba9083ab96106b09
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 11312 bytes
font_02_sfnt_off00013184.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x13184 4324 bytes