PDF malware analysis — malicious · 144b894a908321df

MALICIOUS

PDF

115.4 KB Created: 2021-03-30 14:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23

MD5: 8ab3043799d9b09556c084eebf414a1b SHA-1: a91412321eaf936f919c1652756db3b377d9e736 SHA-256: 144b894a908321df2ac2ccd0c6fa945ee0e67c68531f56d970bb0ff8fee06348

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to drive traffic to potentially harmful destinations.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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://xajibur.ru/strik?utm_term=what+is+dependency+theory+in+political+science PDF link annotation
- https://static.s123-cdn-static.com/uploads/4368485/normal_5fcdb8547e1eb.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4493579/normal_6026692e85bf3.pdfIn PDF document text
- https://wavamabixalovag.weebly.com/uploads/1/3/4/5/134525364/8edc3313a8b90.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4387033/normal_60356e8e70b32.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4450353/normal_605c705684b93.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4420915/normal_5ff8c7398a011.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4490752/normal_6013b0d27750b.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4405904/normal_5ffdc471be4c4.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4377100/normal_5fffe80c67c7d.pdfIn PDF document text
- https://ropojagininu.weebly.com/uploads/1/3/4/6/134635708/7802948.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4368984/normal_5ffc695e5440f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4416132/normal_602f6ee9db328.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/vipinib/zojarivukisaw.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/2dbe2ff5-1d1b-44fb-97b8-31625506c9a6/how_much_does_a_vet_assistant_make_in_australia.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d0da988c-321a-416a-a854-08566c8f468e/nascla_contractors_guide_to_business_law.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/05e0d4f8-02b4-426f-9c8f-b56dd72b3229/73478236660.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/dc3a68ae-c600-4102-b275-45e22aa91b8c/puteralawuguzeri.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a1838ae8-9490-4a10-af6c-741529a5e5f6/puzodonedu.pdfIn PDF document text
- https://s3.amazonaws.com/xazarujokemus/16044843772.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0e7a5e4b-e7df-4057-9a9a-10eaddb686b8/simibirugage.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a15f971b-7961-4f20-b7a2-da06383eb3bc/how_to_set_a_watch_winder_for_rolex.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e55942bc-0728-4362-adc0-3a899c443a61/find_the_size_of_each_exterior_angle_of_a_regular_polygon_with_24_sides.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_off00016dc6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16DC6	5276 bytes
SHA-256: `de8646e23831f849edea74a2dc8bd62f70b1552dd82cf2558c4315a33ff519a2`
`font_01_sfnt_off00017fc4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17FC4	13644 bytes
SHA-256: `6a784a17c28ef08d38ab0c37da309418ccc2539d821ad5b13eba8b070695e344`
`font_02_sfnt_off0001ab0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1AB0F	16060 bytes
SHA-256: `99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953`

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