PDF malware analysis — malicious · f37c250f3c3e7e44

MALICIOUS

PDF

136.1 KB Created: 2021-04-06 16:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 5ce16d92206cafe26cfc965ecfa8db61 SHA-1: 694947c1ee2b27d03174eee41cac7922acfea8eb SHA-256: f37c250f3c3e7e44957f6b96eba3a0c630a9d8eb78211d9482c302970ebc3908

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The document body, though heavily obfuscated, contains text related to 'broadcast message android app', suggesting a lure. The presence of multiple external URIs, including one pointing to 'maypoin.ru', indicates the likely intent to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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
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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://maypoin.ru/123?utm_term=broadcast+message+android+app PDF link annotation
- http://zokidinodajives.getenjoyment.net/62628275824.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4391047/normal_604f86f804824.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4411228/normal_5fdba4093170b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4469641/normal_6016a518a8dff.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4385014/normal_5ff972b67456c.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4379856/normal_60084966cb2fa.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4489428/normal_6064b48082043.pdfIn PDF document text
- http://gakawisogafuga.mygamesonline.org/analog_computer_and_digital_computer.pdfIn PDF document text
- http://sozerujodurepef.22web.org/makalah_endometritis.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4393779/normal_5fdcce09164ff.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4445106/normal_6050c3f135000.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4389821/normal_606797f28e0d0.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4382613/normal_601fb223d7c13.pdfIn PDF document text
- http://balegetiwep.mywebcommunity.org/queen_bohemian_rhapsody_piano.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4503584/normal_6013aeb188fd4.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4424043/normal_6014d5513f2c6.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
- http://suduxegowur.onlinewebshop.net/casio_2747_aw-81.pdfIn PDF document text
- http://duwujupis.epizy.com/xagalezoduzuwabefaj.pdfIn PDF document text
- http://suvalomimo.atwebpages.com/tufinuzokunaxezinividaj.pdfIn PDF document text
- http://taperimogitunal.epizy.com/54046338077.pdfIn PDF document text
- http://vulopekusape.atwebpages.com/56790933652.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_off0001ccf3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1CCF3	5200 bytes
SHA-256: `8c2d5c5a3f94c2f7688baab6747ee36f9014416f3222b2dfebeb414d0dc3ce4d`
`font_01_sfnt_off0001de7d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1DE7D	11392 bytes
SHA-256: `290b8a23f454d7b2c5598594c1723de62c4c77a3238e59758aa3e2ce2336375a`
`font_02_sfnt_off000204c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x204C7	4324 bytes
SHA-256: `9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2`

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