Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9da6f061b82b36…

MALICIOUS

PDF

80.9 KB Created: 2021-05-18 23:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbc67b329408ba337510ba7101fc068d SHA-1: 74b5c5a76f63be474d06f1469da632afc443beb2 SHA-256: af9da6f061b82b3698e546522c295f11602ec088252b3d5c5a53daf90112bec5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious websites. The primary malicious URL identified is https://bologen.ru/strik?utm_term=how+to+make+homemade+perfume+pdf, which is likely used for phishing or to distribute further malware.

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://bologen.ru/strik?utm_term=how+to+make+homemade+perfume+pdf
    • https://nokavapeselodes.weebly.com/uploads/1/3/4/6/134638024/guvelopumajukimez.pdf
    • https://cdn-cms.f-static.net/uploads/4380078/normal_606475ddef708.pdf
    • https://jedujidiki.weebly.com/uploads/1/3/4/3/134352610/b7a1f87.pdf
    • https://cdn-cms.f-static.net/uploads/4410983/normal_60650a5d6ef5b.pdf
    • https://cdn-cms.f-static.net/uploads/4406208/normal_60597938df8ea.pdf
    • https://kizufujuzuvajet.weebly.com/uploads/1/3/5/3/135316206/2161363.pdf
    • https://cdn-cms.f-static.net/uploads/4381104/normal_60489772ebddf.pdf
    • https://lavolobaned.weebly.com/uploads/1/3/0/7/130740571/8b7bea8596cb11f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/01d18cc7-930a-453e-b7df-157c5945cbe7/22785546842.pdf
    • https://uploads.strikinglycdn.com/files/ad6d0b91-8472-4f0f-875a-be2e5f3f5ef8/i_am_not_famous_quotes.pdf
    • https://uploads.strikinglycdn.com/files/39a15a74-c7f6-4976-a240-dd4e13b493d3/4340789094.pdf
    • https://uploads.strikinglycdn.com/files/8e7086db-a03c-4828-8d61-ec407036d2c2/24672603578.pdf
    • https://uploads.strikinglycdn.com/files/4e124621-a5f1-41da-ae49-7636871f56dd/what_is_an_abundance_of_caution.pdf
    • https://uploads.strikinglycdn.com/files/f0ecf212-63cc-4dbc-9579-caf205f80e6e/autocad_mechanical_2021_tutorial_deutsch.pdf
    • https://uploads.strikinglycdn.com/files/4655938a-089f-4d36-a127-dbf78506e7cb/wf-2540_paper_jam_error.pdf
    • https://uploads.strikinglycdn.com/files/8bc80353-dcb0-4608-9c2b-e14d01b57dde/how_to_install_a_hybrid_hot_water_heater.pdf
    • https://uploads.strikinglycdn.com/files/c925b657-cc04-4053-a037-986ab3bb0d7d/brave_new_world_revisited_summary.pdf
    • https://uploads.strikinglycdn.com/files/7d26384a-c4b3-4631-bac1-244a9167504f/oracal_631_vinyl_application_instructions.pdf
    • https://uploads.strikinglycdn.com/files/2464e9d3-89a9-4807-9c6a-859acfdcc84e/why_does_my_pilot_keep_going_out_on_my_water_heater.pdf
    • https://uploads.strikinglycdn.com/files/19aa1b95-238e-47fe-afe8-eba2257fef63/my_cloud_wd_admin_login.pdf
    • https://uploads.strikinglycdn.com/files/18c1ad3d-4283-45e3-b503-e3f5f02815ad/44629002344.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_off0000fdbf.bin
39096496a3975c539123a9e85029b4f78c3e69bdc975881c15fda04068f2de84
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 5188 bytes
font_01_sfnt_off00010f48.bin
b53b67fc4ddc7b01ce15fd11616849f85b1541160f87f6f77e70ce34a659f076
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F48 11432 bytes