PDF malware analysis — malicious · fd971461b0f17fae

MALICIOUS

PDF

70.5 KB Created: 2021-01-13 17:01:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b9385c9deac5e5e277cec6a843327f0f SHA-1: 7b032e3cdd7da9b9bf293786b910662d1eb66b62 SHA-256: fd971461b0f17fae47e8a2690e5c2c7c0e09fa30d20af9acf226905a359605dd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic and the ML_NYX_PDF_MALICIOUS classification. The ClamAV detection further confirms its malicious nature. The embedded URLs suggest an attempt to redirect users to phishing or malware-hosting sites, likely as part of a spearphishing campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=the+tale+of+the+three+brothers+pdf
- https://cdn.sqhk.co/xubulozirod/XZMaEa5/ramekaje.pdf
- https://site-1171534.mozfiles.com/files/1171534/galaxy_on_fire_2_full_hd_pc_trainer.pdf
- https://site-1217437.mozfiles.com/files/1217437/vewoduf.pdf
- https://site-1178468.mozfiles.com/files/1178468/what_do_crows_eat_and_drink.pdf
- https://taxubixud.weebly.com/uploads/1/3/4/7/134760406/9a19f0a0.pdf
- https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/xudaf.pdf
- https://site-1174757.mozfiles.com/files/1174757/t_mobile_store_number_near_me.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/tapexiw/91761288346.pdf
- https://s3.amazonaws.com/nazekisigiduz/wifi_booster_free_for_android.pdf
- https://s3.amazonaws.com/dobesogum/65949875334.pdf
- https://s3.amazonaws.com/kujapomib/dividing_complex_numbers_khan_academy_answers.pdf
- https://s3.amazonaws.com/tojabixefova/apr_performance_gt-_250_spoiler.pdf
- https://s3.amazonaws.com/levumoduf/4th_grade_vocabulary_words_and_definitions_worksheets.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d806.bin` `b4803e86be470802c5f2d5d7bb05c003380f0a84efa0904a7f42a5f109c507c4`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD806	5216 bytes
`font_01_sfnt_off0000e9b6.bin` `4026da2a9bcd1d057bc89d2f522a0df6ae454d3a945d768fe0f7219ebbadb5c8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9B6	10364 bytes

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