PDF malware analysis — malicious · f528a322840c44ef

MALICIOUS

PDF

70.5 KB Created: 2020-12-17 18:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15

MD5: 1aafad5bf2913e9c63548d185288ff9d SHA-1: dec05717de432bd046e0ecd1b3797bc63e7c4d3b SHA-256: f528a322840c44ef3d82ea8dcb0b3408eea1ca48a23655442b35be1cbafc5356

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, and also detected by ClamAV. It contains a large number of embedded URLs pointing to external PDF files, indicating it functions as a link farm. One of the primary URLs, 'https://gettraff.ru/strik?utm_term=ark+use+single+player+settings', is flagged as a malicious redirector. The document's structure and content suggest an attempt to manipulate search engine results or distribute further malicious content through the linked PDFs.

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
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
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://gettraff.ru/strik?utm_term=ark+use+single+player+settings In PDF document text
- https://cdn-cms.f-static.net/uploads/4407795/normal_5f96c884d9734.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4458848/normal_5fa8fd0d54ae0.pdfIn PDF document text
- https://wivixape.weebly.com/uploads/1/3/4/8/134897282/d307095f2b7.pdfIn PDF document text
- https://wuriwodek.weebly.com/uploads/1/3/4/6/134688082/gopodosadagogojiz.pdfIn PDF document text
- https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/tifuzijoluxed-sipopesix-venok.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4407576/normal_5fb80d55ead38.pdfIn PDF document text
- https://xinibazekude.weebly.com/uploads/1/3/4/6/134666807/1437629.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4445889/normal_5fbc31373f15c.pdfIn PDF document text
- https://fawawivog.weebly.com/uploads/1/3/4/5/134595284/soxukimiduzasik_senufigudig_xewebotomino.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426421/normal_5fc19c1e608b9.pdfIn PDF document text
- https://jizufozerujit.weebly.com/uploads/1/3/4/3/134343201/9155862.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4384304/normal_5fb815ef270e7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4448986/normal_5fd8e6bda1b49.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4483346/normal_5fca84776c49d.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/4d8868e3-8958-448a-a2f7-a88884324f13/florida_charter_amendments_guide.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_off0000c0f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC0F8	5144 bytes
SHA-256: `afc3272ed679ade9ff9ebdb14a019582c1e87791bc02ca9f3f7fb73cd054daea`
`font_01_sfnt_off0000d296.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD296	10852 bytes
SHA-256: `28af081b6f7a5840c9fad4333652ab1fd24e8e1e463383b5f753049b1e802df2`
`font_02_sfnt_off0000f811.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF811	16140 bytes
SHA-256: `37d0c007c0a4f7bc8a10091960c820b0c2e7b87c858fe467d0565ee1a1a9b473`

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