Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7b8f7ba0c8b328…

MALICIOUS

PDF

80.7 KB Created: 2021-05-29 10:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e977ff4dda5ff3b052792bb28ca0c28 SHA-1: b1b12415910f635a7ed6a31731c9ecfd46553e33 SHA-256: ef7b8f7ba0c8b32850220257b5b4ab0201a48746e9cc2266b00e3f1e63664a7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The PDF contains a large number of external links, many pointing to other PDFs hosted on strikinglycdn.com, indicating a link farm. While no scripts were extracted, the presence of numerous external links suggests an attempt to direct users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kinuguno.weebly.com/uploads/1/3/1/4/131454024/b78be3af391eec1.pdf
    • https://xizerusepu.weebly.com/uploads/1/3/4/3/134308384/2724aefdc.pdf
    • https://cdn-cms.f-static.net/uploads/4485436/normal_6045e6a8e0f8d.pdf
    • https://cdn-cms.f-static.net/uploads/4417129/normal_6049ef1b68879.pdf
    • https://cdn-cms.f-static.net/uploads/4380229/normal_60357714f1c5c.pdf
    • https://mawosamaretezij.weebly.com/uploads/1/3/4/8/134860838/ruvemoraje_kivositi_mikiletim.pdf
    • https://cdn-cms.f-static.net/uploads/4457330/normal_60146d9f6da2d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://feedproxy.google.com/~r/wb/ENAH/~3/o_fyKxYoRT8/wb?keyword=delta%20monitor%201700%20series%20temperature%20adjustment
    • https://uploads.strikinglycdn.com/files/7f411149-cb2d-459e-b35d-04bb50edff99/lipunepog.pdf
    • https://uploads.strikinglycdn.com/files/78afbcfc-a143-49dd-b49e-f4e3f3815ab9/90525034635.pdf
    • https://uploads.strikinglycdn.com/files/bcfc12b6-e6dd-42ff-97d7-fce462b7a2dc/nigujazafuwoleta.pdf
    • https://uploads.strikinglycdn.com/files/65e33cf5-aa25-4822-8523-f621ec2d3729/sowunikokar.pdf
    • https://uploads.strikinglycdn.com/files/4ff3c67d-329d-42eb-bbfe-b1395e370e3a/what_is_the_energy_storage_molecule_of_cells.pdf
    • https://uploads.strikinglycdn.com/files/2ee273f7-ccd9-460e-bb02-0eff9b515e99/what_does_ming_hao_mean_in_chinese.pdf
    • https://uploads.strikinglycdn.com/files/376b975f-b220-4f83-a7a2-923a3c2734b0/why_is_the_ds_light_flashing_on_my_modem.pdf
    • https://uploads.strikinglycdn.com/files/b4a9d53a-9606-45fe-8a17-fd3b49108b6e/the_shack_wings__brews_el_paso_tx_79936.pdf
    • https://uploads.strikinglycdn.com/files/0f0d708e-1c8c-4ccc-9f86-837c9ba59a35/ritetemp_thermostat_programming.pdf
    • https://uploads.strikinglycdn.com/files/2ce37884-80e9-4f42-82b5-85d82379abd5/mepol.pdf
    • https://uploads.strikinglycdn.com/files/70580624-791d-4038-92dc-df13543e39da/wunuwezilavaporowuzosoke.pdf
    • https://uploads.strikinglycdn.com/files/294d7192-6573-4daa-b039-62c80ef6e32d/11838010458.pdf
    • https://uploads.strikinglycdn.com/files/c767c3fb-01e0-4a4d-a1a0-78daa9b3e7d6/which_braava_is_best.pdf
    • https://uploads.strikinglycdn.com/files/2270b6d6-6840-4757-a547-cdb906fa1495/94742402585.pdf
    • https://uploads.strikinglycdn.com/files/12675613-7f42-41f1-8a9d-afd98066a2f8/99773745588.pdf
    • https://uploads.strikinglycdn.com/files/3634b016-6c33-4f8c-98ef-38d3b30ba0e1/wikem.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee88.bin
2759b1d223be83982925935b17bb3aee8683efd81f2cf0c5b03a2244e7fc1a68
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 5336 bytes
font_01_sfnt_off0001009b.bin
9af9fdc16b840b58b86eee3157e9121b1fa8e24d54ec348d20c91eb922de8fd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 11240 bytes
font_02_sfnt_off000126cb.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x126CB 4324 bytes