PDF malware analysis — malicious · 8ba5c3878dd6daa9

MALICIOUS

PDF

83.7 KB Created: 2021-09-12 19:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 14f52e79945e5efddd0709141cca074d SHA-1: a1ed1e652f4cc3505d0ae5f0eb78807cf0cba5c6 SHA-256: 8ba5c3878dd6daa97dcdb729454cfa4b5340555f3b6c80124828b6b182828c17

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing campaign or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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
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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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 http://yousefmaktabi.com/ckfinder/userfiles/files/77793422455.pdf In PDF document text
- http://dongtienlamnghiep.com/upload/file/pujuvanajisivalaj.pdfIn PDF document text
- http://automsystem.com/UploadFile/file/20210907140730081.pdfIn PDF document text
- http://stylekd.ru/files/29232613161.pdfIn PDF document text
- http://pttaccounting.com/userfiles/files/bofubefuzuwonepuga.pdfIn PDF document text
- http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/g4jclgr8nnb0bam1dlsatmk6i6/31757732898.pdfIn PDF document text
- https://hsse.hssanesteban.cl/files/68000209678.pdfIn PDF document text
- http://gymostrov.org/gymostrov/userfiles/file/matenivobilizev.pdfIn PDF document text
- http://safetruck.gr/images/file/24539868379.pdfIn PDF document text
- http://logisticsnetworks.net/ckfinder/userfiles/files/97276974755.pdfIn PDF document text
- http://kraski-chernila.ru/resources/file/kuwexamemalunob.pdfIn PDF document text
- https://metricgroup.it/uploads/file/88700020512.pdfIn PDF document text
- http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/tifiwanezujunudikusim.pdfIn PDF document text
- http://eg-connect.com/uploads/editorfiles/file///22185631618.pdfIn PDF document text
- http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/wejebovezuwojexasubosak.pdfIn PDF document text
- http://sdds.be/userfiles/file/40881334425.pdfIn PDF document text
- https://efficimm.fr/userfiles/files/zitadonu.pdfIn PDF document text
- https://sassanoproperties.com/FCKeditor/file/fefawagetewapila.pdfIn PDF document text
- http://stevis.cz/files/file/17136774169.pdfIn PDF document text
- http://topaslt.com/userfiles/file/960697019.pdfIn PDF document text
- http://iphonedown.com/ckfinder/userfiles/files/ladesevuropizamowinagemo.pdfIn PDF document text
- https://tnmkor.com/FileData/ckfinder/files/20210908_54202A8A568B2AD5.pdfIn PDF document text
- http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/3141360071.pdfIn PDF document text
- http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09bbb7de9---35643255325.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=transfer+files+from+iphone+to+android+wirelesslyPDF link annotation
- 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://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_off0000e1c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1C5	17452 bytes
SHA-256: `72aa9c6a3e96d665987054a3fe3e7a0b82d364d07c974eca867899a0c087a625`
`font_01_sfnt_off00010f28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F28	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001273f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1273F	10924 bytes
SHA-256: `e34e2798ed99edaca5dad12fdbd5b4aa00fc3d954ebedcb878f15f9827455863`

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