PDF malware analysis — malicious · 7c710f459a13fa84

MALICIOUS

PDF

78.4 KB Created: 2021-02-17 18:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11

MD5: bed4a1a0d830c6ce4039e14abfd41e1f SHA-1: 6121a1a51c780e7f0f957cf0c38c27ae8f96691c SHA-256: 7c710f459a13fa84d1cde9e6b001b4866b4658ada0c22b6d9cdf19aa2ee8a769

236 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains heuristics indicating it is a phishing document and employs social engineering tactics, specifically a 'ClickFix' attack and a browser extension installation lure. The document body, though truncated and obfuscated, contains references to 'install manual' and 'wkhtmltopdf', suggesting a user-initiated action is expected. The presence of numerous external links, many pointing to PDF files, indicates a link farm or distribution mechanism for malicious content. While no scripts were directly extracted, the nature of the lures suggests potential for JavaScript execution or exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

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.
ClickFix social engineering attack high SE_CLICKFIX

Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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://bologen.ru/123?utm_term=th3210d1004+install+manual PDF link annotation
- https://cdn-cms.f-static.net/uploads/4445550/normal_5fd9776d6709d.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4449397/normal_5fc82fdf719b8.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4452863/normal_5fdeca3ad8f55.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4480408/normal_6022bf7c26244.pdfIn PDF document text
- https://piwomokoxik.weebly.com/uploads/1/3/5/3/135335333/3ee38266.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4393625/normal_5fcef63933e1c.pdfIn PDF document text
- http://tetutunugu.iblogger.org/34696103670.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4423714/normal_601caba766393.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4480161/normal_5ff7a8dbb7269.pdfIn PDF document text
- http://bamigewagozajom.iblogger.org/28537393120.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://s3.amazonaws.com/rowubunak/actinobacillus_equuli.pdfIn PDF document text
- https://s3.amazonaws.com/gupojakami/benefits_administrator_job_description_template.pdfIn PDF document text
- https://s3.amazonaws.com/bupesejirijejus/psychology_books_in_malayalam.pdfIn PDF document text
- https://s3.amazonaws.com/tirimofufemukat/google_agenda_partag_android.pdfIn PDF document text
- https://s3.amazonaws.com/tumuzu/britax_advocate_expiration.pdfIn PDF document text
- https://s3.amazonaws.com/wobuzisibal/76866336354.pdfIn PDF document text
- https://s3.amazonaws.com/kudefem/lavibobejesa.pdfIn PDF document text
- https://s3.amazonaws.com/buwosevax/bts_2019_season_s_greetings_eng_sub.pdfIn PDF document text
- http://residarifuwus.rf.gd/c_o_n_full_form.pdfIn PDF document text
- https://s3.amazonaws.com/vebenok/77026428886.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_off0000e793.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE793	5152 bytes
SHA-256: `45ed07292112f743ad0dfd0e0ede19cc89c32079f8282669618f6a33da4b4180`
`font_01_sfnt_off0000f8d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8D7	10984 bytes
SHA-256: `b89fd5a4468bb8984b69be64deff8e062a78eb6e7b858302df484688b9f87604`
`font_02_sfnt_off00011e1e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E1E	4324 bytes
SHA-256: `7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71`

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