PDF malware analysis — malicious · 90d9111393c2532f

MALICIOUS

PDF

142.5 KB Created: 2021-05-24 22:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 5f01d0f9b5f165bbd5b2127011fdddd1 SHA-1: 53cf3d956140cfdd4b3b2890c3097ee58c85b45c SHA-256: 90d9111393c2532f11a51e561720227e3a2c83b43c1c9044a21bf99737cf2818

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with one primary URL identified as malicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the identified malicious URL.

Machine Learning

Nyx PDF Classifier malicious score 0.9986

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://baarspo.ru/strik?utm_term=precalculus+mathematics+for+calculus+7th+edition+teacher%2527s+edition
- https://tufojeju.weebly.com/uploads/1/3/0/7/130740258/mebopafewet.pdf
- https://munowimil.weebly.com/uploads/1/3/1/4/131406650/bamutapoj.pdf
- https://ruwiwiteviporiz.weebly.com/uploads/1/3/4/7/134767377/57040b839809.pdf
- https://pozuxopukemo.weebly.com/uploads/1/3/4/7/134705319/zonagupakenun_jawemerifo_pamafulumi.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/sisaxu/knife_sheath_making_supplies.pdf
- https://s3.amazonaws.com/vovopafubipu/evernote_apk_old_version.pdf
- https://s3.amazonaws.com/sewamos/3609886052.pdf
- https://uploads.strikinglycdn.com/files/56cd3ea4-8015-44e1-a4df-bbe7279090a5/beats_studio_2_wireless_noise_cancelling.pdf
- https://s3.amazonaws.com/simujix/solar_system_3d_model.pdf
- https://s3.amazonaws.com/safago/goals_and_objectives_template.pdf
- https://uploads.strikinglycdn.com/files/e0d43b11-2f81-42c9-8efa-c0ad53538b8a/22042126305.pdf
- https://uploads.strikinglycdn.com/files/58da656b-a06e-408b-a4a3-05966dc6ab48/dobixikusixukadu.pdf
- https://s3.amazonaws.com/woneketelak/henri_cartier_bresson_decisive_moment.pdf
- https://s3.amazonaws.com/bisiku/xunewuderini.pdf
- https://s3.amazonaws.com/divikufifir/bekunepediratawigimusale.pdf
- https://s3.amazonaws.com/ninazarila/medical_certificate_format_for_admission.pdf
- https://uploads.strikinglycdn.com/files/13ac4bd3-6bc5-48cc-985c-fffd453a555b/sufuxepamiwigik.pdf
- https://s3.amazonaws.com/fefurorobumi/vujuvivaro.pdf
- https://s3.amazonaws.com/sizabo/insert_watermark_online.pdf
- https://s3.amazonaws.com/wujodibu/35387554014.pdf
- https://s3.amazonaws.com/jijari/46552172709.pdf
- https://s3.amazonaws.com/tosevud/wavepad_full_version.pdf
- https://s3.amazonaws.com/foneniz/kanijapateg.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_off0001f101.bin` `800784039362d53753767cc6fc3cac91c76507a21e6008123a80839c47ed8fb2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1F101	5376 bytes
`font_01_sfnt_off0002032f.bin` `a22f669cd0d34f9485873d3ab8fffbeb8778f5a81fa4d041cd72244548951663`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2032F	11092 bytes

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