PDF malware analysis — malicious · b113e18eb98d78af

MALICIOUS

PDF

78.5 KB Created: 2021-02-25 16:50:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20

MD5: 4f580b16662cebcb46b438c6c69e5a25 SHA-1: b5313112f63b4c7d580639d3457e6da78de26848 SHA-256: b113e18eb98d78afc2c5ffd55328f7e67253dae5029d36b8a3f16216a99c2a2b

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or SEO spam document. It contains a large number of embedded links pointing to external websites, including a known malicious redirector. The document body, though heavily obfuscated, appears to contain text related to search engine optimization, further supporting the link farm hypothesis. No scripts were extracted, but the presence of numerous malicious links suggests an attempt to redirect users to harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://yafferge.ru/123?utm_term=adverbs+of+degree+examples+list In PDF document text
- https://cdn-cms.f-static.net/uploads/4372753/normal_600eaef367307.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4464521/normal_60165151b1c2f.pdfIn PDF document text
- https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/9116414.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4492575/normal_6018450b85711.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4408324/normal_5fc56dfda4771.pdfIn PDF document text
- https://fojumotapikapig.weebly.com/uploads/1/3/4/3/134372119/laverugi-notepofedojuto-gitofojifugukib.pdfIn PDF document text
- https://lilonukile.weebly.com/uploads/1/3/4/7/134767916/jidekosejatevuf.pdfIn PDF document text
- http://navevukosuso.mypressonline.com/74636796328.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4411916/normal_5fea305844c2d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4417419/normal_5fe9d6ee24271.pdfIn PDF document text
- https://motoburibekisi.weebly.com/uploads/1/3/4/6/134623685/revan.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369911/normal_601e6fc2b9006.pdfIn PDF document text
- http://worameruvejaka.mywebcommunity.org/372445333.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4391920/normal_5fd79d5827f21.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4413454/normal_60061f3d27e0c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4409123/normal_6015ade03220c.pdfIn PDF document text
- https://wajuzetixageg.weebly.com/uploads/1/3/0/9/130969085/d0470ce87db2dd4.pdfIn PDF document text
- https://matixibufi.weebly.com/uploads/1/3/0/8/130873880/juxetob.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f42b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF42B	5620 bytes
SHA-256: `cdf9e1afc886699836fac4772967628808ede7652703c129f5fdf2065f48a9a2`
`font_01_sfnt_off00010734.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10734	10992 bytes
SHA-256: `00a778338562eaab18359a884a434e9ab2a8f3c177f4d3248010adf34700d5da`

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