PDF malware analysis — malicious · 81b41ddd2d31f53b

MALICIOUS

PDF

100.5 KB Created: 2021-03-15 18:59:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 458281d69b8cfa990b49363665242c64 SHA-1: bb23448acb342e403d07ba4e3f51b05e013307ee SHA-256: 81b41ddd2d31f53b36574c47dc24940287867a025d1069f87e1700d58d0555bf

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to economics, aiming to trick users into clicking embedded links. The presence of external URIs suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 5

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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/123?utm_term=rationality+assumption+in+economics+pdf PDF link annotation
- https://static.s123-cdn-static.com/uploads/4481411/normal_5ff929fbbb243.pdfIn PDF document text
- https://cdn.sqhk.co/munemuzabuk/bb1hhdO/82768275023.pdfIn PDF document text
- http://jarewitof.mypressonline.com/analytical_reasoning_questions_and_answers.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4368504/normal_5fcc51c4ea1dd.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4457561/normal_600264cdc4151.pdfIn PDF document text
- http://sujabupinoda.scienceontheweb.net/83032781269.pdfIn PDF document text
- http://zazorin.scienceontheweb.net/how_to_use_new_hermes_engravograph.pdfIn PDF document text
- https://cdn.sqhk.co/romafime/ichaiaR/13242617246.pdfIn PDF document text
- https://cdn.sqhk.co/mozejipakas/ibzogg3/silent_partner_agreement_template_south_africa.pdfIn PDF document text
- https://cdn.sqhk.co/femelofep/Sia4aSc/world_nature_conservation_day_2020_quotes.pdfIn PDF document text
- https://cdn.sqhk.co/javeduner/hjfjiib/65391336191.pdfIn PDF document text
- http://gimemuwet.mypressonline.com/mokajomozexe.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://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_928a7cab8e854cc9907a46c9f19880cb.pdf?index=trueIn PDF document text
- https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_d795f5a584e34ae481710e8aae5beb04.pdf?index=trueIn PDF document text
- http://zudupaxub.myartsonline.com/lizutupuvekobut.pdfIn PDF document text
- https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_1a3f0391f05648a1bd1180919df46411.pdf?index=trueIn PDF document text
- https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_88d8c2254e7a48f3a726e5ad16d34ed9.pdf?index=trueIn PDF document text
- https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_922a658522fa47058a98c3398a049cf6.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000122fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122FA	5196 bytes
SHA-256: `221cbfbefa14507009d3f0f33c30081dc55dd1a78f69fc86466b7373c282f4b0`
`font_01_sfnt_off000134a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x134A6	10988 bytes
SHA-256: `c8c013bccb68f4102ce18497cb651066ece45e18f62fc626f9976649820e6ef9`
`font_02_sfnt_off00015a63.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15A63	17972 bytes
SHA-256: `58d8e139d4e95e905dd446f87c1242679a0a6781914f626565f9f0d3194baafc`
`font_03_sfnt_off00017620.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17620	4324 bytes
SHA-256: `1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e`

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