PDF malware analysis — malicious · e265de8978355fe3

MALICIOUS

PDF

105.1 KB Created: 2021-03-22 06:00:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: d3628902e74821669eb745468ceee322 SHA-1: b08812ddbbee3a322a83b56ecb3649c82149e5d2 SHA-256: e265de8978355fe39d24fda3c2175684e45f7afdf8ec0eda8b27c7eae8123a8c

174 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains heuristics indicating it is a link farm on disposable hosting and includes an external URI pointing to a suspicious domain. The ML classifier and ClamAV detection strongly suggest maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it's a PDF related to stretching routines, likely a lure. The presence of security bypass instructions further supports a malicious intent, likely to trick the user into downloading a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Security software disable instruction high SE_SECURITY_BYPASS

Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
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://golowaki.ru/strik?utm_term=total+body+stretching+routine+pdf PDF link annotation
- https://cdn-cms.f-static.net/uploads/4409811/normal_60116e81ca794.pdfIn PDF document text
- http://sozaxesugoj.mywebcommunity.org/bioshock_guide.pdfIn PDF document text
- http://eeuuurrrrr.space/dufepumusamigir5a226.pdfIn PDF document text
- http://vuvulusigi.scienceontheweb.net/dnd_5e_warlock_spell_list.pdfIn PDF document text
- http://hopecommunitynaz.com/borukulawosafifagodon8pip.pdfIn PDF document text
- http://fifewub.22web.org/jenajigoxupugexavevev.pdfIn PDF document text
- http://evilcheats.fun/asus_rog_crosshair_viii_hero_wifi_bios_update4yhoi.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4451228/normal_604021f8ccc70.pdfIn PDF document text
- http://byseles.xyz/how_to_sketch_a_nose_for_beginnersn83es.pdfIn PDF document text
- http://donovorax.22web.org/lowosegulenuzifedetudexes.pdfIn PDF document text
- http://capridigi.com/213908357854wrvg.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4409258/normal_601324c0e309a.pdfIn PDF document text
- http://pirojibanenuzi.getenjoyment.net/cazadora_de_hadas_3.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://vawerudarasikow.myartsonline.com/jowozuveriwi.pdfIn PDF document text
- https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_ac413514725e461bb193f8eea3849461.pdf?index=trueIn PDF document text
- https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_4d824be4b1794a4eb90eb24f9edcc52a.pdf?index=trueIn PDF document text
- https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_0ab14230c41e4e788ed603de97a07721.pdf?index=trueIn PDF document text
- http://nufuwulevek.epizy.com/how_to_install_honeywell_thermostat_pro_series.pdfIn PDF document text
- http://xuvuzonixo.onlinewebshop.net/94657957268.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_off0000ffb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFB5	29332 bytes
SHA-256: `92aa77ba8a0b092aac142ac314993d54cf47035144a05f4431205088d4bb4323`
`font_01_sfnt_off00015b98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15B98	5608 bytes
SHA-256: `e4add6e6564526abed49510369eaad6bbb1e74a316c4f0f30e84f6dabb935d38`
`font_02_sfnt_off00016ea6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16EA6	11324 bytes
SHA-256: `dd2080a8ba77188ddbbbbd8d7755bc9ce638f7596a65b7e6285d73ca0e5280d3`

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