Malicious PDF — malware analysis report

Static analysis result for SHA-256 354f4f8a2194d484…

MALICIOUS

PDF

99.9 KB Created: 2020-11-24 03:14:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 67c36fd9d1c5e3ab46e9dbc5f0a1a092 SHA-1: 163c9c475bd9be98d41aefd8017cbee4556b44a0 SHA-256: 354f4f8a2194d4848690541895068229457b7609d88214d8e411f7d8250c1691
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pattern. The primary URL 'https://trafftec.ru/strik?utm_term=nios+504+assignment+in+tamil+pdf' suggests a lure related to an assignment. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 5

  • 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.
  • 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://trafftec.ru/strik?utm_term=nios+504+assignment+in+tamil+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5faa6b52a2ab3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5fabc83032516.pdfIn PDF document text
    • https://jivoxixipilekok.weebly.com/uploads/1/3/4/8/134885045/wazamufiraruro-muvewofedifosi-robepetor-zavebog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392668/normal_5f920704a2e20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_5f9d418e555cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_5f93168cbbfff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a7e8f4-6803-4baf-95d8-a203608aaf5e/meriveruwaroxo.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/wing_chun_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/vodafone_annual_report_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26a88aaa-99f4-4920-a192-19cf73274ae8/sagitinujogub.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/xuvufimewewuvi.pdfIn PDF document text
    • https://s3.amazonaws.com/bodepova/62637836697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f20d508-cf6f-4bae-9c0f-260449fbebd6/gifiwawamubajolowag.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/vokofelirirunazaluwo.pdfIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 11

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE19 3220 bytes
SHA-256: d79750bb2f20a3ba9bb930b6b4b31105ffbe3c34e59909da052283356c1a5161
font_01_sfnt_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 5588 bytes
SHA-256: 73559e339fe59257ea7e26ddae73d89822a131bf6c8cca9a419bd0736cc2ad2a
font_02_sfnt_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 2656 bytes
SHA-256: c206ac4eca120f096112d408dff6b33a2f721090936d80486df636e1cd240fde
font_03_sfnt_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 4944 bytes
SHA-256: 658369fdf4dbfcc549ff0dbb011939356d60280aa168350d25aadc0d5ebdd447
font_04_sfnt_off000107b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B7 2328 bytes
SHA-256: 3702365b3034b9d7945da23b991b5e2ac3f8bb06d1ba3be7e5ba1b5d8dd48c9f
font_05_sfnt_off0001126e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126E 2108 bytes
SHA-256: e66bd646ff29f48b94a898642357a1d5295b77faffa0bd70eb77acb4aebc9a97
font_06_sfnt_off00011c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C44 2604 bytes
SHA-256: 7f3a1ef136f36ba68bc36e5bcd31de243dce7f4b60e01c4bc40f508baeb48ca0
font_07_sfnt_off0001275e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275E 4336 bytes
SHA-256: 87016e8933cc862d1d188edfbee698abcff8178ed3d6b510b61737ee02f60284
font_08_sfnt_off000134ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FF 10632 bytes
SHA-256: 288a91de419da746f40f619166f8ae3cb0b46c6d67ca5425dab338288c29d459
font_09_sfnt_off00015951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15951 7768 bytes
SHA-256: 78f61d33486afa62956a5862754f8c25e1f77a607e0bc0de21cb2496893d1842
font_10_sfnt_off00017357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17357 2608 bytes
SHA-256: c4869f4910101e9de114603d80c87e7465cc14a3edf423f39a6ef78b10429b6f

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