PDF malware analysis — malicious · dfd93d92a24c98b5

MALICIOUS

PDF

99.4 KB Created: 2021-03-30 13:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22

MD5: d9933bc0c051320fa677cfaa2c5e7a5f SHA-1: c9480291107294a08254acafda97beaaa830fc7a SHA-256: dfd93d92a24c98b5f49ea61d7186f143fec9597deba09be89a1ca52d9fb9eb56

192 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a high ML classifier score. The presence of a 'download button' lure further supports a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lead the user to download a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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 links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than 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.
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
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://crophysi.ru/award?keyword=appsc+group+2+syllabus+telugu+pdf+download In PDF document text
- https://cdn-cms.f-static.net/uploads/4365642/normal_6033bb776e1a6.pdfIn PDF document text
- http://kiwudaliditejo.iblogger.org/27975952490.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4370303/normal_603e5772736a0.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4448121/normal_5fca9559215bc.pdfIn PDF document text
- http://kobasobapina.22web.org/54631594016.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4370304/normal_5ffb672342e78.pdfIn PDF document text
- http://mini-cam1.club/john_dewey_high_school_alumnidjc0k.pdfIn PDF document text
- http://tells.fun/3431651323irjvn.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4475995/normal_5fd0f7c609db5.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4456999/normal_6011808ac422d.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4369182/normal_5ff89b6eec3a3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4373281/normal_60609d2d4ffa8.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://fedorahosted.org/lohitIn PDF document text
- http://sizamix.epizy.com/relative_clauses_exercises_with_answers_for_class_8.pdfIn PDF document text
- http://satuvet.epizy.com/66465016268.pdfIn PDF document text
- http://wikatamuk.rf.gd/spanish_army_uniforms_1800s.pdfIn PDF document text
- https://s3.amazonaws.com/sonutopexaramuf/how_to_use_an_oven_for_baking_a_cake.pdfIn PDF document text
- https://s3.amazonaws.com/wetevali/dubulig.pdfIn PDF document text
- https://s3.amazonaws.com/wexukufedepim/jukubajemukulagiwa.pdfIn PDF document text
- https://s3.amazonaws.com/sikuva/cellophane_sheets_amazon.pdfIn PDF document text
- http://wodurijije.epizy.com/90s_quiz_game_answers.pdfIn PDF document text
- http://visagiza.epizy.com/10934008249.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_off0001011b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1011B	5776 bytes
SHA-256: `aaf73b70100032366fe6f3d901afcb2d627e26edb0bd2a7e0e19c2959080256d`
`font_01_sfnt_off000114ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114EA	35268 bytes
SHA-256: `dcfd9549a41d58b6e1e739d095c6bcf132abd38eacd57d32f83d345493f6637d`
`font_02_sfnt_off00015b28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15B28	10664 bytes
SHA-256: `63ee0776982ba30e14ee53942db16f6eb092694fb3f515804809858be466c62a`

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