PDF malware analysis — malicious · b2ff0cbd3fea59a2

MALICIOUS

PDF

77.7 KB Created: 2021-04-18 15:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21

MD5: 483b74980bcbbfb91bc77b007460a53b SHA-1: fcc3e88fabe11d159a105af6f1062268fabd2b59 SHA-256: b2ff0cbd3fea59a2c62f589fe5046aa729dd331b270294a8f16f9d666582b2d7

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting and a callback phishing lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL with 'utm_term' parameters, suggesting a phishing or scam attempt. The presence of multiple external URIs, many pointing to potentially disposable domains, reinforces the phishing and link-farming nature of this PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://ponafet.ru/strik?utm_term=mcgraw+hill+ebook+promo+code+2021 PDF link annotation
- https://cdn-cms.f-static.net/uploads/4404103/normal_602224965d69c.pdfIn PDF document text
- http://zilitimo.getenjoyment.net/gofoluposaliravitupena.pdfIn PDF document text
- http://es50off.pro/68995998585ecv2p.pdfIn PDF document text
- http://xomunuxeju.sportsontheweb.net/how_to_word_search_a_scanned.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379034/normal_606adb31a28ab.pdfIn PDF document text
- http://yazansoft.com/wumomavikalizfp0w7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426090/normal_5fe709a2c0113.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4414174/normal_6031de8514f69.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4476002/normal_606455109f482.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4381321/normal_604bc13a57702.pdfIn PDF document text
- http://vedice.ru/what_is_a_2.1_soundbarnfqxo.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4422180/normal_6054e7abbefdd.pdfIn PDF document text
- http://rumurel.mywebcommunity.org/descartes_meditations_summary_3.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://uploads.strikinglycdn.com/files/bb964706-eb9a-49f1-b096-d5311e3a3163/lozidefokesivuwes.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d31163fb-1481-44b0-9793-07ad1c1559cf/how_to_train_your_dragon_book_series_1_read_online_free.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6de74202-f297-4cc2-8687-4ebc6d8f2557/willy_wonka_and_the_chocolate_factory_deleted_scenes.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/4463302e-63c3-4c82-a350-3207ee7e4014/wolinofolapupitapojujim.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7909691f-873d-4f17-b2cd-ecfe6a7fb306/jedig.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/52778f10-7c67-45a1-bb24-417e580cb46f/13621315340.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_off0000e341.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE341	5536 bytes
SHA-256: `b08cea6404b5b18ae7b6f3ebd261c7869b85a0c0456a05ddb094e8ad28abd53c`
`font_01_sfnt_off0000f620.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF620	10936 bytes
SHA-256: `8ba5d5fab1ebbb1a2ae5b388c6d9d83cd841f0c2a2782331ce8eaef1c701919e`
`font_02_sfnt_off00011b96.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B96	4324 bytes
SHA-256: `d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378`

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