PDF malware analysis — malicious · d7af40818fc975b2

MALICIOUS

PDF

87.6 KB Created: 2021-05-25 16:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23

MD5: 88f1ac261e991c7156029c6cc31c26a3 SHA-1: 1b252f667ebf67bb7fde13617b9b7e1d09073ae4 SHA-256: d7af40818fc975b230343fda139ef416e2e1cb9e708c8d86b6ac29a68b377372

186 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 0.9998

Heuristics 6

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.
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://nipisod.ru/strik?utm_term=diferencias+entre+soluciones+hipot%25C3%25B3nicas+hipert%25C3%25B3nicas+e+isot%25C3%25B3nicas PDF link annotation
- https://cdn-cms.f-static.net/uploads/4409118/normal_606aedc82886a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4447101/normal_6044c9ba95dc8.pdfIn PDF document text
- https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/99bed1102d6.pdfIn PDF document text
- https://tibuvaji.weebly.com/uploads/1/3/4/7/134720571/3764657.pdfIn PDF document text
- https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/766eca.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4381539/normal_5ffdfdd806588.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4449990/normal_6030fc32e664f.pdfIn PDF document text
- https://rofasaxoropop.weebly.com/uploads/1/3/5/3/135316675/1323330.pdfIn PDF document text
- https://vukosigubew.weebly.com/uploads/1/3/4/8/134860762/gijuka.pdfIn PDF document text
- https://xaxarudo.weebly.com/uploads/1/3/0/7/130740130/d92eed58ca.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4465941/normal_5fd785b952982.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369914/normal_604cf7a77af51.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://uploads.strikinglycdn.com/files/8c37770d-f92d-45f1-862d-4877b3174dc9/73514500467.pdfIn PDF document text
- https://s3.amazonaws.com/xulepiwa/9206755100.pdfIn PDF document text
- https://s3.amazonaws.com/mexijegedakol/gezuwonexulisewotukif.pdfIn PDF document text
- https://s3.amazonaws.com/gurupixabogivaz/windows_10_version_1803_stuck.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/28a26e3d-378d-4c3e-9edd-8bfe7ecec61f/why_did_montresor_vow_revenge_on_fortunato.pdfIn PDF document text
- https://s3.amazonaws.com/xidulumexi/32710378000.pdfIn PDF document text
- https://s3.amazonaws.com/nosepevozux/dozoxuzujuzadexarekepilug.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_off0001034a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1034A	5120 bytes
SHA-256: `0b3fc7c51786e4711e2b794aff2e88504be4c3d2fdd44f3957868d6ffd431f69`
`font_01_sfnt_off0001146c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1146C	13104 bytes
SHA-256: `8668a00df3a3f0586bef8b80b8952f918d6e5f590ff7c02a824e32205fb2fe52`
`font_02_sfnt_off00013f0c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F0C	4324 bytes
SHA-256: `05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176`

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