PDF malware analysis — malicious · 23739a78928b4db4

MALICIOUS

PDF

78.6 KB Created: 2021-03-21 02:10:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21

MD5: ac216735071c7dfeb40c7c6fb839847d SHA-1: b064728f49d4c4ce81f533715cd0948bc701fe0c SHA-256: 23739a78928b4db4737217129c23e1257b5aa21fcfcb3bcdad6879201301fe0c

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links to websites, many of which are hosted on disposable domains and appear to be part of a link farm. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports 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 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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://xezojetit.ru/wix?keyword=watch+midsommar+online+free+google+drive PDF link annotation
- http://nefuwumimo.iblogger.org/autoloader_blackberry_z10_10._3._2.pdfIn PDF document text
- https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/xulakodifu.pdfIn PDF document text
- https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/7dc5dd3.pdfIn PDF document text
- http://mazoxobiziwikut.iblogger.org/xiaomi_smart_watch_price_philippines.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4421365/normal_5fceeefec942d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4409095/normal_6032fb654a6d7.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4463262/normal_5fc74766e07a6.pdfIn PDF document text
- http://wexoxunesixu.iblogger.org/free_healthy_cookbooks.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4477401/normal_5fc95da55914e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4470981/normal_604681c9b3a1c.pdfIn PDF document text
- https://jetisinodab.weebly.com/uploads/1/3/5/3/135335938/4303366.pdfIn PDF document text
- https://dofikusoru.weebly.com/uploads/1/3/4/4/134472045/5714067.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4475406/normal_5fd7eb864c284.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4412568/normal_6051f917da2a2.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366324/normal_6044f6a48c383.pdfIn PDF document text
- https://vutadatibanol.weebly.com/uploads/1/3/4/8/134883393/4db5d3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4479214/normal_600e84d1cbfe7.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/03b1a8f8-ee42-4680-9667-d7d19e7f7b31/best_books_for_12_year_olds_nz.pdfIn PDF document text
- http://vaxavepado.rf.gd/90284290162.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/306d74b4-70b0-4c22-8b05-a7d5c5ec9819/friedberg_linear_algebra_5th_edition_solutions.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7adca4e3-aa19-4d41-b164-dcd83e6e52c2/20106203561.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/179724d7-3137-4995-83fc-c8175280d84a/fantastic_mr_fox_movie_review.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f662.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF662	5508 bytes
SHA-256: `0ecf72ac4151544fba860cd62bc7cffe0c3ecaf37ce22dd8dbd1f7b43a77d4ef`
`font_01_sfnt_off000108ff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108FF	10448 bytes
SHA-256: `b98bc0e83e682776625a93e261dd4ee914997c06fba9aa82a27241f0776aea3f`

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