Malicious PDF — malware analysis report

Static analysis result for SHA-256 890f3d317a9feb29…

MALICIOUS

PDF

78.8 KB Created: 2021-04-06 03:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e422d43051f657f2837ebd95dc12009 SHA-1: 69aa3c71734f39e68e00acae69dc442bec40a245 SHA-256: 890f3d317a9feb29d749ac74de0cf3f502c640e766bec5d1af7636b8bafdfda9
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing document and hosts a link farm. The embedded URL points to a suspicious domain, likely intended to host malicious content or redirect the user. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/strik?utm_term=diablosport+intune+i3+update
    • https://cdn-cms.f-static.net/uploads/4383146/normal_605cb621d1468.pdf
    • http://wowitaly.pro/48651748513a3xjp.pdf
    • http://moreprodukti.com/vazolawosogegigaxemofeh5xzh.pdf
    • https://cdn-cms.f-static.net/uploads/4389604/normal_6026a3ec2927f.pdf
    • http://olx-delivery.cc/todos_los_simbolos_de_diagrama_de_flujo_y_su_significado22rxo.pdf
    • http://cetly.xyz/chalay_thay_saath_movie9qa6y.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c57c06aa-6145-4b8d-b2a4-31f86502ba6b/whistler_cr90_power_cord.pdf
    • https://7d7e9a41-1eea-4c72-a0b8-c0e3d642de37.filesusr.com/ugd/513cfa_e5ad9b19393144a88b7659ee5ac1201f.pdf?index=true
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_3bc61217713341e6b5e439ca0d1e2566.pdf?index=true
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_6884869de9554185ba32b677a452d7a1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9d8c1454-4ba8-41fb-aca5-709ed0edc000/craftsman_self_propelled_lawn_mower_parts_model_917.pdf
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_ae41dccb483c4df1b185985221c12b41.pdf?index=true
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_c1442e418ff54e95b64bc151e5e73220.pdf?index=true
    • https://s3.amazonaws.com/satulibaren/beef_jerky_dietary_information.pdf
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_f889d17fdc7d4c03b34f463d75a641ae.pdf?index=true
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_6b83e574a37c4e60abe45676310531e9.pdf?index=true
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_7b90e77fac1d40888ab3b8497faaee64.pdf?index=true
    • https://uploads.strikinglycdn.com/files/87dd6306-0302-4f40-b5bb-c1b058c81ed6/90729778612.pdf
    • https://uploads.strikinglycdn.com/files/7f6998aa-f803-455e-b560-099b1f88596d/infinix_note_9_price_in_pakistan_2020.pdf
    • https://uploads.strikinglycdn.com/files/4da3c5b9-66c8-470c-8ccc-7043260a1ac9/bedidixevuditisozumi.pdf
    • https://s3.amazonaws.com/rotowan/panchatantram_telugu_movie_songs.pdf
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_9543bdece13e4a1199a59cad81c50ed2.pdf?index=true
    • https://a35b4eae-300a-44a5-b982-8d633984e519.filesusr.com/ugd/19735e_695cd34cb5684a98991ccb921b8322dc.pdf?index=true
    • https://s3.amazonaws.com/ritoma/32740172478.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_off0000f5a0.bin
1d37cf0bc1b9bfb3e4b51b8b43e70ad7d42c6b183500e396d4a33ecd98749898		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 5256 bytes
font_01_sfnt_off00010788.bin
8fe7de6722d2fe329399faf737c957b8c1eff5c8be1f53522af8af78546fdbf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10788 11340 bytes

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