PDF malware analysis — malicious · bfcfdcb36813c340

MALICIOUS

PDF

73.6 KB Created: 2021-02-12 00:13:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17

MD5: 6254686f6b3c8e4f77268a88aeb59da5 SHA-1: a59e1e01db755d78733cec0c4689b779731ac2a1 SHA-256: bfcfdcb36813c340d4c32ad96af4c02f150ec58b3bf670f17b120d603171762d

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious content, possibly for phishing or malware distribution.

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
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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://jacksth.ru/123?utm_term=mission+guide+gta+vice+city PDF link annotation
- https://cdn-cms.f-static.net/uploads/4366027/normal_60144faf59c6e.pdfIn PDF document text
- https://joninotabuxid.weebly.com/uploads/1/3/5/3/135387421/5dee3afa0.pdfIn PDF document text
- https://cdn.sqhk.co/pixazizaze/d3kMVi5/98541891616.pdfIn PDF document text
- https://bajupeboxima.weebly.com/uploads/1/3/5/3/135327322/4067690.pdfIn PDF document text
- https://cdn.sqhk.co/zezovajav/eifbgfF/kusejodabizenopajow.pdfIn PDF document text
- https://cdn.sqhk.co/vobevufubito/hahfjfT/nesovuveposufi.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4385437/normal_5fed19adda3e7.pdfIn PDF document text
- https://cdn.sqhk.co/zoxogatuv/cFpRjcg/boo_monsters_inc_costume_baby_diy.pdfIn PDF document text
- https://fasexonepagi.weebly.com/uploads/1/3/0/9/130969542/4521822.pdfIn PDF document text
- http://am-sound.ru/eagle_s_peak_osrs_quick_guide16ywx.pdfIn PDF document text
- https://cdn.sqhk.co/repipedifavi/gjPiajc/kleptocats_codes_patio.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4393186/normal_6002fb86cf42f.pdfIn PDF document text
- https://jowiginuzag.weebly.com/uploads/1/3/1/4/131438641/9531197.pdfIn PDF document text
- https://cdn.sqhk.co/muwazubivotu/iTZyjdt/formula_1_qualifying_results_italy.pdfIn PDF document text
- http://air-calm2.club/90751953330pkbah.pdfIn PDF document text
- http://tegor.xyz/76966128123t0pgc.pdfIn PDF document text
- https://cdn.sqhk.co/fiwujumejuf/ihjhicF/outbreak_company_female_characters.pdfIn PDF document text
- https://cdn.sqhk.co/tizesefetus/uHiglIU/pick_a_brick_cups.pdfIn PDF document text
- https://vomenipof.weebly.com/uploads/1/3/4/5/134585177/miladuvad-sefupitam-lowiwunibo-xukudimeve.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4412394/normal_5fcb333131a31.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426696/normal_602071b7a3842.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d730.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD730	3080 bytes
SHA-256: `8574919c7c8a9f024103958ce015253c5a24b8e646cdb5f787658918713f2b2b`
`font_01_sfnt_off0000e238.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE238	5144 bytes
SHA-256: `8c68ba51675459a4f5190f87d3875c73be92ff815b95aed291f364537d1f31b7`
`font_02_sfnt_off0000f3e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3E9	11200 bytes
SHA-256: `1e4f9db9a8b1cf06cf69b33a899b6d317ef0d85cb380d76afdb5b00b5ae00741`

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