PDF malware analysis — malicious · 0b585abb5fa1cef0

MALICIOUS

PDF

80.1 KB Created: 2021-02-19 11:46:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15

MD5: ac661e7e0ea1ea2203942ef765c1d4b1 SHA-1: c74384c2b90381eb916c1f132bfad8ecfed5853f SHA-256: 0b585abb5fa1cef0ce901d1e7de9bfb9a77ca9f1e2dd56c7f37163d6e84c0787

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One of the embedded URLs, 'https://baarspo.ru/strik?utm_term=how+to+change+pump+belt+on+bissell+proheat', indicates a potential phishing lure disguised as a search result. No scripts were extracted, but the PDF structure and numerous external links are indicative of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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.
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://baarspo.ru/strik?utm_term=how+to+change+pump+belt+on+bissell+proheat PDF link annotation
- https://cdn.sqhk.co/numokafas/SemQgck/pencil_case_vocabulary_in_spanish.pdfIn PDF document text
- https://cdn.sqhk.co/detaludolef/HDJgige/home_treatment_for_neck_muscle_pain.pdfIn PDF document text
- https://cdn.sqhk.co/wibononuve/idCScAx/indoor_rock_climbing_scottsdale_az.pdfIn PDF document text
- https://cdn.sqhk.co/kavonalitego/lja1Djj/spiral_roll_game_download_uptodown.pdfIn PDF document text
- https://cdn.sqhk.co/dijogiper/agghHHV/zoxomoxejotibufuxuzerazaz.pdfIn PDF document text
- https://detiloxobaz.weebly.com/uploads/1/3/1/3/131398171/1d61f9d31c54baa.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4470968/normal_601a80929afc6.pdfIn PDF document text
- https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/pozizizifimutomi.pdfIn PDF document text
- https://cdn.sqhk.co/buwuvibija/dqoIgyr/usb_audio_player_pro_apk_cracked.pdfIn PDF document text
- https://davufafelasipip.weebly.com/uploads/1/3/4/3/134328138/senokogirawini.pdfIn PDF document text
- https://cdn.sqhk.co/xawobovuji/gJigjhC/radiant_cut_diamond_drop_earrings.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4377938/normal_6018da46db764.pdfIn PDF document text
- https://zoxuzula.weebly.com/uploads/1/3/4/4/134489613/rakugas-rapaxipigozi.pdfIn PDF document text
- https://xigolomo.weebly.com/uploads/1/3/4/4/134483438/tasosimadatijep.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4490722/normal_5fd9b384cbea1.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://s3.amazonaws.com/zulezov/accident_incident_report_form_qld.pdfIn PDF document text
- https://s3.amazonaws.com/zamemigojat/40168064456.pdfIn PDF document text
- https://s3.amazonaws.com/tugafebip/tivewerazivujijitepatagur.pdfIn PDF document text
- https://s3.amazonaws.com/ganubatebedoxez/solowus.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_off0000eaee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAEE	5424 bytes
SHA-256: `d9b7d99cf0aa1e68cc515e67274be5e6b65b05993136f4dfa07117ae2f10fb37`
`font_01_sfnt_off0000fd38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD38	11700 bytes
SHA-256: `86d03a9e0ee1591b28d8cd13d33ad49098c988e0c62d6cf2051e71786d43a2fa`
`font_02_sfnt_off00012490.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12490	4324 bytes
SHA-256: `a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f`

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