PDF malware analysis — malicious · 71fa28eb26989b2c

MALICIOUS

PDF

69.1 KB Created: 2021-01-01 11:56:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 41915d258428d8610b93700909a5f105 SHA-1: 6abd713ec6f7622fcd4c5dfef03d54c29ae7f349 SHA-256: 71fa28eb26989b2c55f16c2cc59e8ded1d0ad909544e73cd0b0669d7324f0ca5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9877

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://traffine.ru/123?utm_term=electrical+double+layer+ppt PDF link annotation
- https://bijariruxo.weebly.com/uploads/1/3/1/3/131382387/6741fc2245.pdfIn PDF document text
- https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/4c9bf1cd.pdfIn PDF document text
- https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/c9d249c5e121.pdfIn PDF document text
- https://gaxasexafarud.weebly.com/uploads/1/3/4/5/134590452/9e897b2354801a.pdfIn PDF document text
- https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/6069273.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/5ecc5383-1136-4cd7-b2b2-1961f4b36384/9855350088.pdfIn PDF document text
- https://s3.amazonaws.com/wajufifenoxuj/fipibazitosemidebovur.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/532c4ebc-734c-4878-b921-2654e1ac0ac9/wejufovurizota.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d151.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD151	5088 bytes
SHA-256: `95ab1d23d8aab1ce7bb96f024501ed7295a76c3f6d2c4580f06388786db5ea52`
`font_01_sfnt_off0000e2af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2AF	10996 bytes
SHA-256: `41049567e6683022b8ea95eb0bc32469c2d955db83f1352544b69d7de6554cb2`

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