Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8957eb892acb26…

MALICIOUS

PDF

76.4 KB Created: 2021-03-31 05:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec6eef1728ed94369bee8756f9bb05ae SHA-1: d89cae8c03a3ee82990bd690786a8b6659248c10 SHA-256: ff8957eb892acb26ddca597aca55c358245cd158901ebef92ebce9bc2d1d21c1
196 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings for unrelated terms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. The presence of embedded URLs and the heuristic for a password-protected archive lure suggest the document is designed to trick users into visiting malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nipisod.ru/strik?utm_term=liftmaster+model+877max+manual
    • http://xofitazuregokud.mywebcommunity.org/la_nueva_defensa_fiscal.pdf
    • https://neruwutuwi.weebly.com/uploads/1/3/5/9/135960217/4107581.pdf
    • http://wekanisa.scienceontheweb.net/code_of_points_gymnastics.pdf
    • https://kijomexed.weebly.com/uploads/1/3/1/0/131069838/jasesuwawo-sepuwizaviw-mugixotos-xemaja.pdf
    • https://zofodepeva.weebly.com/uploads/1/3/5/3/135318354/63f49c.pdf
    • https://xamubamujizej.weebly.com/uploads/1/3/1/4/131483378/9237621.pdf
    • https://feronodi.weebly.com/uploads/1/3/0/8/130813799/novat.pdf
    • http://vseti.life/mxq_pro_amlogic_s905_4k_tv_box_firmware_updatelijaa.pdf
    • https://tapogizixe.weebly.com/uploads/1/3/4/8/134897788/dazavivinureralid.pdf
    • http://covid-19online.site/pimixabunugagaig7.pdf
    • https://mavitebe.weebly.com/uploads/1/3/1/1/131163983/rufejozup_zebig.pdf
    • https://jevejokanidepit.weebly.com/uploads/1/3/0/9/130969277/7162025.pdf
    • http://amsidisi.xyz/morning_sidekick_journal_australiaibu9d.pdf
    • http://sait-ok.ru/toro_lawn_mower_carburetor_diagramrho54.pdf
    • http://dotekebenutedex.scienceontheweb.net/heat_exchanger_types.pdf
    • https://pewituzusab.weebly.com/uploads/1/3/0/8/130874049/radimagasibup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_386e4d5dfb3b4f99a9e5e64d227c3fc8.pdf?index=true
    • https://s3.amazonaws.com/dazuxujepov/ruger_lcp_380_holster_left_hand.pdf
    • https://s3.amazonaws.com/lewuli/86735621789.pdf
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_1fe792968cfe4fcf8294ec1278ca5431.pdf?index=true
    • https://s3.amazonaws.com/paxunu/romantic_couple_dance_forms.pdf
    • http://sujawokasafu.onlinewebshop.net/wumasuboxid.pdf
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_ddf9fe0c50494441a83e9be6b3963b3e.pdf?index=true
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_57b4b2f94d2141eab0f42e6cfde23b0a.pdf?index=true
    • https://s3.amazonaws.com/bakoloj/annexure_e1_for_hssc.pdf
    • https://s3.amazonaws.com/xeponodij/aashto_bridge_element_inspection_manual_2013.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_off0000e87d.bin
b43d6020fb8ffcfed1dc8147c44daab6a9c27e23a43a3256af94a39d1b839451		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 5336 bytes
font_01_sfnt_off0000fa9a.bin
9dc6165d8eec679e6c36d216babae9bfdc9b62ee154eb9c8a5074a48f3c6a1fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 11784 bytes

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