Malicious PDF — malware analysis report

Static analysis result for SHA-256 c788f226d3844e17…

MALICIOUS

PDF

109.3 KB Created: 2021-03-16 01:05:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b7f08722305584c827d80b882c34c728 SHA-1: 555e054dafac5deaa042fc54e2315bf653e0a489 SHA-256: c788f226d3844e171a3388eac1c41ebbb855ac128034abb8756fc526ff9fb7e2
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm for SEO manipulation or phishing. The primary URL, https://botokaw.ru/wix?keyword=at%2526t+white+pages+st.+louis+missouri, is likely part of this scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://botokaw.ru/wix?keyword=at%2526t+white+pages+st.+louis+missouri PDF link annotation
    • http://yandex-delivery.cc/how_do_i_connect_my_hp_officejet_4500_wireless_printer_to_my_macf2seg.pdfIn PDF document text
    • http://reform-st.ru/hero_honda_splendor_online_bookinge1es4.pdfIn PDF document text
    • http://vinograd.io/test_statistic_for_paired_t_test_formulaxpdsm.pdfIn PDF document text
    • https://naxibozagut.weebly.com/uploads/1/3/4/5/134580084/7016344.pdfIn PDF document text
    • https://nafoxowozuvika.weebly.com/uploads/1/3/1/3/131383754/4e3e1adda996.pdfIn PDF document text
    • http://damvglaz2.xyz/rca_rts7010b-e1_remoteqjxqm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_7ed4a0ba641443db96e96ba4adb8217f.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_b8cb54a61551447791264ca41490a6bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/edbe1269-ff08-4d2a-8110-097c74450999/28137850805.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_4fe7136152db4e18b29e7b14ef42c123.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a93a1c-20b5-4bb0-b137-e1547cd6954c/videwidafesawexajamez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e80a78d3-fc0d-410a-98dd-dea1fb6caee1/69379404587.pdfIn PDF document text
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_11373614a6eb4ee2a746c20502c6e6e9.pdf?index=trueIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_99a21d5271254878a6291ad83cb885dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da75d08d-d666-4c33-968a-53f8506c8ca3/how_long_is_the_bed_of_a_1999_ford_ranger.pdfIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_f85f0ab82fa043a8b3d6d9771d0cb0ea.pdf?index=trueIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_9f8b80732edf4e4ea7f8d5ac30f8a909.pdf?index=trueIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_7c6641f3431347dd83232bf4990860e3.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_5949d06a96d945cba818a93c1235cd48.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 46168 bytes
SHA-256: 3a7f4a0161fdeca48d4a9dade6b8d3ce56b98e2334cd54a0994eb4d12b687577
font_01_sfnt_off0001704d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1704D 4144 bytes
SHA-256: 8d99b10ab6642920c90bd75e97e4aa2f52d5bbee369924c47dc6fed17b9b865c
font_02_sfnt_off00017e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E6F 12152 bytes
SHA-256: f3ff048e705e1b4365b1b3189bfebdca964627b3f444c662bfbb41d9e6c345c9