PDF malware analysis — malicious · d7fa8a77b92715b3

MALICIOUS

PDF

81.2 KB Created: 2021-05-18 21:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24

MD5: 8acf3b10d71c3951f322f1ec26ff8dc3 SHA-1: cf2853b7e65b4911d93f73676347f2666ce4d5d3 SHA-256: d7fa8a77b92715b3da87d2f112537f1f9fadf629f17af53d372b798b44dbf214

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 other PDFs, suggesting a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 5

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.
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/strik?utm_term=gre+algebra+practice+questions+pdf PDF link annotation
- https://cdn-cms.f-static.net/uploads/4369631/normal_60183e226ef31.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4481273/normal_600f64d9ed008.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4444644/normal_5ffcb595b87f1.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4427811/normal_6037903011a81.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4415052/normal_604ed2dfa807a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4497687/normal_605a10867d82e.pdfIn PDF document text
- https://jutoxanifi.weebly.com/uploads/1/3/5/3/135321179/6571851.pdfIn PDF document text
- https://wisowoturap.weebly.com/uploads/1/3/1/4/131453432/030507fad8c04.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4486356/normal_601af7a6cefaf.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/0cac5ef8-0f8f-4765-97d2-0abdb7370956/82206167559.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/39a283ca-415b-4269-901c-581409956610/vinland_saga_volume_12_release_date.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/932f6edd-9096-4576-8ab0-23bb8389b4be/wekugasesewiweme.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/ab0e449d-0ed8-4185-bfce-dd16b9de3330/what_is_isentropic_flow.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/8eaf058a-0ad3-4428-97c4-bfb65613ad1f/vintage_champion_air_compressor_parts.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/03c91f33-f57d-438b-85e2-85443cb9898b/lafivaki.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/8230e958-783f-4b72-ae6d-db2770c06f19/netgear_wnr2000_max_speed.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7e6bef09-ee62-40fb-9e4c-1b5714674c25/best_morals_for_stories.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a3c3ba70-4afb-4a9e-949d-370df75d8d39/1733945639.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0177c3cd-8166-456f-b398-8d20351f9463/masegefolapurizalubikoxe.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/153b34c4-9c1d-4a3f-93eb-8d43c1b4b4c8/alpha_bravo_charlie_list.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e626.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE626	5620 bytes
SHA-256: `7c6e951369384d98df221c01d4722638d395624abcdc78d9c168f7fd46113d57`
`font_01_sfnt_off0000f940.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF940	10936 bytes
SHA-256: `44a2198cd653dd2d05622452b8f9ddeda27713564ccdaa0ff4432250b3da097f`
`font_02_sfnt_off00011ed3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11ED3	16568 bytes
SHA-256: `6de391358e34d9daeb549e692f399d2dd7dc14f4847bd769fd0f69c569cb233c`

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