PDF malware analysis — malicious · 2d6d85a0a7657a8e

MALICIOUS

PDF

79.5 KB Created: 2021-02-15 13:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22

MD5: baa99094a7acf4c34014aded8ed956ce SHA-1: 1fe625fc51d43c775dfdd84b5ceb16265171ee42 SHA-256: 2d6d85a0a7657a8e9718696a227ee08cc88dfc26ea23d64e8ddd01b3dcfb9d55

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by multiple heuristics and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, appears to contain keywords related to educational materials, likely as a lure.

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://jottigo.ru/wix?keyword=mcgraw+hill+precalculus+12+textbook+pdf PDF link annotation
- https://cdn-cms.f-static.net/uploads/4371004/normal_5fe79779e1bb0.pdfIn PDF document text
- https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/2703612.pdfIn PDF document text
- https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/1796604.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4447647/normal_5ff1be0cd5eb8.pdfIn PDF document text
- https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/digigenejamipokipezo.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4383702/normal_5fff546c283f3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4445326/normal_6015461bd8152.pdfIn PDF document text
- https://kemebawe.weebly.com/uploads/1/3/5/3/135313751/losilu-lewosonob-sadumu.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369305/normal_5fd7c43ba2bc6.pdfIn PDF document text
- https://dapofawebowo.weebly.com/uploads/1/3/5/3/135347186/sukolewaxejexeziz.pdfIn PDF document text
- https://rabuwamefikulo.weebly.com/uploads/1/3/1/3/131398373/d38241.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369657/normal_6028c2ccc5ab9.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4453885/normal_6001dec60296a.pdfIn PDF document text
- https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/xetikufixiwiwatunap.pdfIn PDF document text
- https://donimafu.weebly.com/uploads/1/3/5/3/135395233/xepexirapar.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4365586/normal_5ffd3c021ecee.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4457302/normal_600d9d2bdea9a.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4455890/normal_5ff9017df3813.pdfIn PDF document text
- https://nategenuniko.weebly.com/uploads/1/3/4/7/134749174/f4f84aebee4bb.pdfIn PDF document text
- https://lufeziwupidel.weebly.com/uploads/1/3/5/3/135345985/wulisusalo.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
- 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_off0000eaa8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAA8	5748 bytes
SHA-256: `12de6e77beabc8506297de347f8bf7e349dc52f646a18a0ee22f804c6bd70e5b`
`font_01_sfnt_off0000fe6c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE6C	10596 bytes
SHA-256: `9009212a09555c805fcb305aa9157182da774ffdb4b103e4c48e022c659e8b49`
`font_02_sfnt_off000122bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122BF	4324 bytes
SHA-256: `0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333`

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