PDF malware analysis — malicious · 51dd679669e4d69e

MALICIOUS

PDF

77.4 KB Created: 2021-06-04 04:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13

MD5: f823b7d5b41cbbb6ddeda42a0e21e198 SHA-1: caad03fccd4fab3de7d3a1b0cde2ddccf4e54e5a SHA-256: 51dd679669e4d69e903e4c40f7351b855ba65e9e9f9009f2fbb7eb795382981d

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host multiple links, further supporting a malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 5

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.
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://seumenha.ru/123?utm_term=autumn+leaves+piano+sheet+music+musescore PDF link annotation
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://larabefejaji.pbworks.com/f/95514419265.pdfIn PDF document text
- http://povelin.pbworks.com/f/82509066527.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a455f226-9da9-4605-8f85-384c54ce33b9/chapter_1_review_foundations_of_geometry_answers.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/5ce98b2d-0177-443d-934c-a287c5a72768/half_lives_of_iodine-131.pdfIn PDF document text
- http://masawumel.pbworks.com/w/file/fetch/144420318/33046758002.pdfIn PDF document text
- http://xalomuzavege.pbworks.com/w/file/fetch/144432222/spectrum_remote_instruction_manual.pdfIn PDF document text
- http://wuxikadafi.pbworks.com/w/file/fetch/144420429/zekuwosonawusevagix.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/05379bf3-20f7-4a48-9a45-68097e3d01da/1799913930.pdfIn PDF document text
- http://puzavofan.pbworks.com/f/nugajiwajun.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a7bb5089-11bb-4fe2-8867-ce398fca2ed6/jubiwotevusukunatulerivon.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/3973c3db-0ca9-46ce-97f0-18c13466997c/76664852702.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7e94aeea-6e49-4a93-811e-029bb2a7af73/kibel.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/78a5232b-d57b-4d31-a13e-607347439a13/dell_inspiron_n5010_charger_amazon.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d504eb65-8593-4098-a298-0e9ff7a2d43a/insinkerator_evolution_essential_vs_compact.pdfIn PDF document text
- http://fulusivijomu.pbworks.com/w/file/fetch/144437016/18262870266.pdfIn PDF document text
- http://lerepaxa.pbworks.com/w/file/fetch/144585060/asap_rocky_album_2020_download.pdfIn PDF document text
- http://sisagexal.pbworks.com/w/file/fetch/144504231/xejofozozuzawutumakumasan.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0546e2b7-4129-40dc-b9cc-96a325781e10/does_hdmi_2.0_support_4k_at_120hz.pdfIn PDF document text
- http://nilanom.pbworks.com/w/file/fetch/144416232/61307679533.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6fea14a5-b334-4f1a-92f6-0f9fa96dc64b/sharp_101.6_cm_40_inch_full_hd_led_tv_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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e3f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3F4	3372 bytes
SHA-256: `3c43751f409b066fe27ebed67ab4a14bd4c2554a44ede4b078868dc2bafc3250`
`font_01_sfnt_off0000f006.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF006	5220 bytes
SHA-256: `9a810148dee5ed0d248d47cd53df874fb23c4c1b54b42bbf5fcfacd539d6bb71`
`font_02_sfnt_off000101a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101A3	11524 bytes
SHA-256: `d4118675d5bc69050582f093511c49100cecdf59a728c23041e0244c1d75da69`

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