PDF malware analysis — malicious · eff08c78fdf04863

MALICIOUS

PDF

76.9 KB Created: 2021-02-16 01:00:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17

MD5: 1b9a40b9192807961e93a9853ca9471e SHA-1: adc24944e8d1ed61a805c00f29647f8032d12193 SHA-256: eff08c78fdf048631659eac404a9c395caa31ad175160e7f2d9e31e60f54fca0

246 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ML classifier and ClamAV detection. It contains a link farm with numerous external links, many hosted on disposable domains, and specifically impersonates Microsoft to lure users. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

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.
Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH

Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xidexoxopu.weebly.com/uploads/1/3/6/0/136025366/dakefobozu_devejub.pdf.
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/wix?keyword=life+the+game+unblocked+poki PDF link annotation
- https://xidexoxopu.weebly.com/uploads/1/3/6/0/136025366/dakefobozu_devejub.pdfIn PDF document text
- http://vuwadezizubem.22web.org/baseball_hall_of_fame_guidelines.pdfIn PDF document text
- https://miwimuwal.weebly.com/uploads/1/3/0/7/130775744/sokilot.pdfIn PDF document text
- https://kerobasoxegetun.weebly.com/uploads/1/3/4/0/134017970/powokuk.pdfIn PDF document text
- https://pavofadibap.weebly.com/uploads/1/3/4/3/134370944/350287c4a921.pdfIn PDF document text
- http://onlyforyou.space/hitman_goty_upgradeftv8e.pdfIn PDF document text
- https://fijomenameti.weebly.com/uploads/1/3/0/8/130874411/8122738.pdfIn PDF document text
- http://50offshop.pro/94346489806u9hw9.pdfIn PDF document text
- https://cdn.sqhk.co/lisesemafo/hjgg5XN/60_s_70_s_music_radio_stations.pdfIn PDF document text
- https://gonelato.weebly.com/uploads/1/3/6/0/136082396/91361ec3450e4.pdfIn PDF document text
- http://interbankdigital.com/3913279897172dv2.pdfIn PDF document text
- https://zogudoweno.weebly.com/uploads/1/3/1/6/131637773/getakozo-lafuza-xewimapomum.pdfIn PDF document text
- http://lunesygets.xyz/52553935997bevdv.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
- http://xavisijividefo.epizy.com/hsc_online_marksheet.pdfIn PDF document text
- http://dimuwebogikufuf.rf.gd/choices_high_school_story_book_1_guide.pdfIn PDF document text
- http://salivokeru.epizy.com/ajax_php_form_post.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_off0000e295.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE295	5324 bytes
SHA-256: `9062f941fb28f15625feb7db4add2fe598c55b5689cc8d245029b4458cbe1bf7`
`font_01_sfnt_off0000f48c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF48C	10392 bytes
SHA-256: `9c90f0809ad9f9c9c47c3c100518f5a4ad363bc9cfb10fd0c8d17da6de20b6fb`
`font_02_sfnt_off0001182e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1182E	4324 bytes
SHA-256: `05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176`

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