PDF malware analysis — malicious · a303a264d4ffba75

MALICIOUS

PDF

88.5 KB Created: 2021-02-08 19:58:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12

MD5: 6cff2cf23eb2ba1bbd4ff4ea97ff36cd SHA-1: b4bc5bd70f4832529ddf89748dbb5e835152b7e6 SHA-256: a303a264d4ffba75f33e4f61df06a94332c6a48099a0e95e1614706d7e0e925e

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains an embedded URI pointing to 'seumenha.ru', which is likely used to host a phishing page or a second-stage payload. The document body, though heavily obfuscated, suggests a lure related to mathematical functions, which is a common tactic for phishing campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 4

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://seumenha.ru/123?utm_term=derivatives+of+trig+functions+chart PDF link annotation
- https://cdn.sqhk.co/zikegasenar/SY1hLQJ/pay_express_bill.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4454045/normal_5fd2f9d60bb45.pdfIn PDF document text
- https://cdn.sqhk.co/lenawemijixe/hdhcii7/amaze_word_meaning_in_urdu.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4413469/normal_5fce98fc90784.pdfIn PDF document text
- https://cdn.sqhk.co/soxuvezosapa/bie5t68/download_game_angry_shark_2016_mod_apk_offline.pdfIn PDF document text
- https://cdn.sqhk.co/tewokozogop/62hbvgi/4021260263.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4420775/normal_5fe20a8fc9f58.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4417329/normal_601bb66c6f95d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4454668/normal_5fd62f35a60bd.pdfIn PDF document text
- https://cdn.sqhk.co/ropikenetu/gcnYjif/zusinujidafovutofejoje.pdfIn PDF document text
- https://cdn.sqhk.co/xakurusuk/ghCefB5/magic_cleaner_for_whatsapp.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4372361/normal_601bcf89660c1.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4477637/normal_5fda7465af2e7.pdfIn PDF document text
- https://cdn.sqhk.co/letijefa/5Dgcje5/melumobutanemamatum.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4480886/normal_6007488008a42.pdfIn PDF document text
- https://cdn.sqhk.co/nalawanuxa/JidibNp/6797009821.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/tojabixefova/top_10_reader_app_for_android.pdfIn PDF document text
- https://s3.amazonaws.com/nolarifaforuxop/fukedelebuvejegatirokij.pdfIn PDF document text
- https://s3.amazonaws.com/vedexajawo/nucleophilic_catalysis.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://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fb6a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB6A	5172 bytes
SHA-256: `59baac70f3294b71f82ec7b2c46c7ccde38c03644a32e483e78e25421ac3ce3e`
`font_01_sfnt_off00010d10.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D10	14980 bytes
SHA-256: `bb53b237155db8c1d29b4282575555f2d65297b6ae9ca33716a5ff90ab602049`
`font_02_sfnt_off00013d88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D88	16428 bytes
SHA-256: `a893591ff334a40d84700afceb4190a7e41fd9b8c21dfa7f4bec0991a9fd12b7`

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