Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9934f9b06f2c19b…

MALICIOUS

PDF

92.9 KB Created: 2021-03-19 06:11:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 16e1eaca39821de1a98c3032c8a5eb4e SHA-1: 46a8e18c73fbfbb959e354a348200e20dc69a8f4 SHA-256: a9934f9b06f2c19bc59cf5d9bb82fac9468b6eb04c79071c3c7dd6bfa786aa5b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classification and ClamAV, indicating it likely exploits vulnerabilities or contains malicious content. The presence of a large number of external links, including a link farm on disposable hosting, suggests a phishing or redirection attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear user-facing text indicating a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xajibur.ru/123?utm_term=android+vs+iphone+popularity+2018 PDF link annotation
    • https://cdn.sqhk.co/jefigujaxev/BDFijhd/toy_cars_to_drive_jeep.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/eic7ic5/canon_camera_connect_via_wifi.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/Ddjcrie/fenoluneligiwiluzubepu.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/hjgehi8/tugadig.pdfIn PDF document text
    • https://cdn.sqhk.co/garisuvonuk/bijrLki/turbo_card_app.pdfIn PDF document text
    • http://nelodorofi.iblogger.org/tibiropafexogomogavisu.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/gFSpif0/how_to_draw_plants_vs_zombies_2_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/vefoxewijuja/vxZrigJ/lexinemawesotimubugoba.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimole/ie9Yhjw/16269577559.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_d4ea9ee933e64d08a87d3b4cff8abcb6.pdf?index=trueIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_27783ea01d214898888fa1182f59b18e.pdf?index=trueIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_da3e91900f2d493190aa1d7e3c8583da.pdf?index=trueIn PDF document text
    • https://29bb9f0a-cb36-4278-8b1c-05d86a2267e4.filesusr.com/ugd/25e746_c1759037916c4f8d88b33f70cb404a10.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_df60ee32b5d749adac99a8ee8a8267e0.pdf?index=trueIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_bc2e01b981cf4badbfc671e93e271d8f.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_af2b34fbb71a4084af53fdf3ff00b448.pdf?index=trueIn PDF document text
    • http://tuxexagixib.rf.gd/adam_smith_theory_of_moral_sentiments.pdfIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_2d5837eb666b43aeb947911da50c44e6.pdf?index=trueIn PDF document text
    • http://gifazewuki.epizy.com/english_grammar_test_online_multiple_choice.pdfIn PDF document text
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_d0e23c4ea29a42a1a64a2721fc7d5cf1.pdf?index=trueIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_345cabbfd26c4af8bc178d458c4c29df.pdf?index=trueIn PDF document text
    • http://xumomevafuvozup.rf.gd/ac_dc_transformer_for_led_lights.pdfIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_3398613f50b04c5981391bb05a829ba8.pdf?index=trueIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_b5664b67197b4cfa92e28413e54d5d36.pdf?index=trueIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_c07ccda40d3f439c9d38f616d4b1ea6a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A55 5716 bytes
SHA-256: 9c6e768df77c4f8559e8e4d214d31515dfdc13f486ffb32bbbc71f9154bbaa27
font_01_sfnt_off00013dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD9 11316 bytes
SHA-256: b6214defbbe328bbaffacdd19f56ff0c5ff70e0fa68448b83a6cd8a0bdc517c6