PDF malware analysis — malicious · 9c49e11e12baf498

MALICIOUS

PDF

91.4 KB Created: 2021-06-07 07:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10

MD5: 44b139ecddc0e999d33abb7fa24ff94a SHA-1: 4370816fd3fc54b4e06c8b3f64b268d9a25a49f3 SHA-256: 9c49e11e12baf498fdbe6c6a753313c5a7dd9485913b07ced3bd35efa4e96e14

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to direct users to external sites. The document body, though heavily obfuscated, suggests a lure related to an 'answer key', likely intended for phishing or SEO spam. The presence of numerous external links, many hosted on disposable domains, reinforces this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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://krisoc.ru/pbw?utm_term=energy+storage+and+transfer+model+test+answer+key PDF link annotation
- https://cdn-cms.f-static.net/uploads/4496592/normal_6024b258ce188.pdfIn PDF document text
- https://static.s123-cdn-static-d.com/uploads/4495860/normal_60b1980214c5e.pdfIn PDF document text
- https://farigelud.weebly.com/uploads/1/3/4/2/134266281/rakitowasebanuva.pdfIn PDF document text
- https://gugajonegil.weebly.com/uploads/1/3/0/8/130813642/divawexaku.pdfIn PDF document text
- https://kigokowolabewal.weebly.com/uploads/1/3/4/1/134132594/kutusuxipej.pdfIn PDF document text
- https://barufaworu.weebly.com/uploads/1/3/5/9/135957986/fb62bb8f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4405179/normal_60bae11570b9e.pdfIn PDF document text
- https://mewarikubunaku.weebly.com/uploads/1/3/1/6/131637951/kigeno.pdfIn PDF document text
- https://bazowumisobebu.weebly.com/uploads/1/3/5/3/135329866/4e08b971.pdfIn PDF document text
- https://mujiborabasovu.weebly.com/uploads/1/3/4/5/134590634/gunokelituxoka_vatajagupo.pdfIn PDF document text
- https://bedaruwi.weebly.com/uploads/1/3/5/3/135326402/xiworarefeja.pdfIn PDF document text
- https://voxonevixes.weebly.com/uploads/1/3/4/3/134383310/fbf3a9.pdfIn PDF document text
- https://bisuxijux.weebly.com/uploads/1/3/5/3/135323954/8141934.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4383460/normal_604aa47668226.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4443821/normal_6069e03136043.pdfIn PDF document text
- https://muduzefob.weebly.com/uploads/1/3/4/0/134018051/tirosovawemif.pdfIn PDF document text
- https://wotewaga.weebly.com/uploads/1/3/4/6/134615540/litodikap_sugagifasu_xutebo.pdfIn PDF document text
- https://pinenovi.weebly.com/uploads/1/3/4/5/134509314/1404966.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://xuwuziz.pbworks.com/f/how_to_do_visual_narrative.pdfIn PDF document text
- http://raravisu.pbworks.com/f/how_to_make_your_own_graph_on_google_docs.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_off000117ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117CA	5184 bytes
SHA-256: `3e332eae41be79a860b6bc4ca50766903f1bd3cf37a35e7cd981e13662027e4b`
`font_01_sfnt_off00012971.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12971	11908 bytes
SHA-256: `f74061476c36f1751f7ab8b963a416845f7e7653a18b27f824b81064ba561897`
`font_02_sfnt_off00015206.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15206	4324 bytes
SHA-256: `0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333`

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