PDF malware analysis — malicious · 993c30212d6a5ae4

MALICIOUS

PDF

71.2 KB Created: 2021-03-22 08:25:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02

MD5: 03f8c00e8a759dcda8efcb91e221ab8e SHA-1: 1213adb2028fd4e123e183b01b4f14bf444333af SHA-256: 993c30212d6a5ae490d06bdbab7eb7493420be64a75666168319ad8a1320fc62

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links pointing to disposable hosting services. The ML classifier and ClamAV also identified it as malicious. The embedded URLs suggest a phishing or SEO manipulation scheme, likely intended to lead users to malicious sites or download further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
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://golowaki.ru/wix?keyword=electric+circuits+cloze+answer+key PDF link annotation
- https://murufirekitopu.weebly.com/uploads/1/3/1/8/131856476/d2649938ea5.pdfIn PDF document text
- https://cdn.sqhk.co/regavebike/igEggYL/35413731552.pdfIn PDF document text
- https://wapifonobuj.weebly.com/uploads/1/3/4/7/134744781/57b004141801.pdfIn PDF document text
- https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/pexubajamipi.pdfIn PDF document text
- https://pedulexonevexo.weebly.com/uploads/1/3/0/7/130740508/vebazepulug.pdfIn PDF document text
- https://xetasigebe.weebly.com/uploads/1/3/4/4/134443645/pofav.pdfIn PDF document text
- https://cdn.sqhk.co/jagibuvat/UbbSCgi/hungry_shark_world_game_play.pdfIn PDF document text
- https://dovavifedudefew.weebly.com/uploads/1/3/2/7/132710721/1052746.pdfIn PDF document text
- https://gorofegi.weebly.com/uploads/1/3/4/4/134462705/40173a.pdfIn PDF document text
- https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/rotazosete.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://uploads.strikinglycdn.com/files/0e9d1870-2341-4338-93ce-c51e0a4df341/65765532778.pdfIn PDF document text
- http://rodigosixe.rf.gd/rasebagufobojakoxevul.pdfIn PDF document text
- https://s3.amazonaws.com/punurum/cambridge_ielts_listening_8_test_1_answers.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d1c9b617-b7e6-4c41-8dee-96c4365893c3/xarififurejiwisozizukobur.pdfIn PDF document text
- https://s3.amazonaws.com/rujimidujek/3357707269.pdfIn PDF document text
- http://buvanudune.rf.gd/8004754372.pdfIn PDF document text
- https://s3.amazonaws.com/gavapozalilup/boiler_water_level_control_system.pdfIn PDF document text
- https://s3.amazonaws.com/wetevali/how_to_change_oil_on_a_ariens_ikon_x_52.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/89adefe4-a18c-4173-8c65-57997bef5851/joziguxupumovewaloj.pdfIn PDF document text
- http://kugefosames.rf.gd/calma_emocional_bernardo_stamateas_gratis.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d0cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD0CF	4940 bytes
SHA-256: `530290b5f9e27b505c33cf44f3b829c2167c479b495e4161e2763a2a25795301`
`font_01_sfnt_off0000e1c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1C5	9308 bytes
SHA-256: `c206d9dd12e6cea749c8b349bee78ff84f2f16794d9c7d6535ac403df127c1ec`
`font_02_sfnt_off00010190.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10190	4324 bytes
SHA-256: `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`

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