PDF malware analysis — malicious · a148cdd51b60e3ed

MALICIOUS

PDF

83.0 KB Created: 2021-09-23 00:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 799355bcb1dddd95734a4b83d4e00b03 SHA-1: 186b82e715778df55e9e8b078eedf1151b9b7d84 SHA-256: a148cdd51b60e3ed782be01320231b42b2f74457c286e60c3c07d4047573312a

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. It contains numerous links to external websites, many of which are identified as link farms on disposable hosting, suggesting a phishing or malware distribution scheme. One high-severity heuristic points to an algorithmically-generated URL that likely serves a malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

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 link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://laborke.ru/uplcv?utm_term=android+app+installers PDF link annotation
- http://flairpens.ru/uploads/files/58320403787.pdfIn PDF document text
- https://stoneappeal.in/FCKeditor/file/1114755537.pdfIn PDF document text
- http://szermgrt.hu/uploads/ckfinder/userfiles/files/kizuloj.pdfIn PDF document text
- http://bhhangkhong.com/upload/images/files/dilomobebupokoviw.pdfIn PDF document text
- https://qfuse.it/images/uploaded_files/ckfinder/files/1631588129_784622a931.pdfIn PDF document text
- http://flex-link.cn/uploadfiles/files/ninabadatozugojewavuxu.pdfIn PDF document text
- http://gourmethousemacau.com/UploadFilesfile///35659628318.pdfIn PDF document text
- http://ozkayalartrans.com/userfiles/file/tufivivitufopur.pdfIn PDF document text
- http://abovomedia.hu/_user/file/dizewazimuparagoba.pdfIn PDF document text
- https://mimzyonline.com/userfiles/file/wodofagof.pdfIn PDF document text
- http://bfttacg.marketsearching.com/upload/files/72850050982.pdfIn PDF document text
- https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/c06e43b636c2fcdd3d54fb46d4eeec9e/kupif.pdfIn PDF document text
- https://jetaime-shop.dvsportbg.com/files/3547561435.pdfIn PDF document text
- https://kenkochaya.com/user_data/ckfinder/files/dujutipuvotopilonava.pdfIn PDF document text
- https://path.mn/userfiles/files/26182639416.pdfIn PDF document text
- http://namngonviet.vn/user-/files/28760237997.pdfIn PDF document text
- https://takarasushimn.com/userfiles/files/44931617060.pdfIn PDF document text
- http://flex-link.cn/uploadfiles/files/58685481582.pdfIn PDF document text
- https://ambulatorioveterinariosismondi.eu/file/tawepalanuzidudixigi.pdfIn PDF document text
- http://jmvlpslimited.com/ci/userfiles/files/8018028180.pdfIn PDF document text
- http://bsa-billiard.by/images_from_html_editor/file/lirumogorasobufakoz.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://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_off0000e0fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0FE	17852 bytes
SHA-256: `453c190d0ee6731fa6b09b12ab39b021bee9af56fedfd39f4bceb516c4470d92`
`font_01_sfnt_off00010f0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F0F	10368 bytes
SHA-256: `28337d15cc10384b8f6a4da6c86f583f8de7152c1210ebfeedb519c818dad560`
`font_02_sfnt_off00012699.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12699	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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