Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a18a867616806c8…

MALICIOUS

PDF

79.0 KB Created: 2021-05-24 22:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7a102e68050133514d6d0df3323cc90 SHA-1: 9211e7310f2c9eb1ea7f1fcf26452b62f41304fd SHA-256: 5a18a867616806c80e357153a406be03b9cfa39ca2152a51836f3362a9c2ffcf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to SEO-optimized PDF documents, indicating a link farm or phishing attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=how+to+play+dirt+rally+in+vr+vive
    • https://cdn-cms.f-static.net/uploads/4469101/normal_601a680c60e2c.pdf
    • https://static.s123-cdn-static.com/uploads/4417530/normal_5fe02f107e86a.pdf
    • https://pojojozujivalim.weebly.com/uploads/1/3/1/1/131164399/lekukuxusa.pdf
    • https://binolopokam.weebly.com/uploads/1/3/1/4/131484395/nibuweroriv-losow-morelolidezab.pdf
    • https://static.s123-cdn-static.com/uploads/4459324/normal_5ff38bb295836.pdf
    • https://nusepetuvake.weebly.com/uploads/1/3/3/9/133997573/1154255.pdf
    • https://mavusuwavonim.weebly.com/uploads/1/3/4/4/134493404/bisagu.pdf
    • https://lasapiboxemifol.weebly.com/uploads/1/3/4/8/134865682/5281300.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fidefofudi/cnet_uk_s.pdf
    • https://uploads.strikinglycdn.com/files/8bec9997-8cad-4f78-90f4-aeb2da25cfb3/tawikimarekutas.pdf
    • https://uploads.strikinglycdn.com/files/dc4cfe12-9411-4c8e-b6b7-0afedd016039/how_to_earth_a_microwave_oven.pdf
    • https://uploads.strikinglycdn.com/files/cff03b83-b9e6-4271-8f7e-76477273634f/rataf.pdf
    • https://uploads.strikinglycdn.com/files/a400188f-ee0c-441d-a3d2-d284dc25f325/81212227631.pdf
    • https://uploads.strikinglycdn.com/files/4ec85349-4f2f-4846-bafa-4d6e82e45a2c/paruwewizetafaluzexokaz.pdf
    • https://uploads.strikinglycdn.com/files/1fef4a65-ad19-4ba1-bbce-950231e9d778/how_to_read_a_bra_size_chart.pdf
    • https://uploads.strikinglycdn.com/files/bea3e1f0-2ee9-461d-8a02-6f274266af1f/lg_lfx31945st_02_parts.pdf
    • https://s3.amazonaws.com/luxelula/21940595972.pdf
    • https://uploads.strikinglycdn.com/files/7f172aec-6ff6-4ef9-bc15-77e1e7e866d4/21565843781.pdf
    • https://uploads.strikinglycdn.com/files/68a58756-cb2e-4a33-befb-dbbd951f4de3/how_to_fix_a_maytag_dishwasher_control_panel.pdf
    • https://uploads.strikinglycdn.com/files/cd749e81-1f58-4f95-97ae-db37df880b45/sivaji_the_boss_mp3_songs_download_isaimini.pdf
    • https://uploads.strikinglycdn.com/files/4f6c9768-ca6d-4ac8-83f1-f25138faf165/how_do_you_cook_ribs_in_a_pressure_cooker.pdf
    • https://uploads.strikinglycdn.com/files/e90cedb0-9b30-4ba7-8992-17a7f2e2a2f5/who_uses_the_nasb_translation.pdf
    • https://s3.amazonaws.com/bamepofewalada/zusolirika.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_off0000f256.bin
9fff0bf6928527e68aa96627dc720658364c0a76d6dc7fbb1f90ddd78d82a7ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 4992 bytes
font_01_sfnt_off00010379.bin
836cf7011bc483832133f2b10e4cc907162006be296e5b52a86aae02226a459a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10379 13928 bytes