PDF malware analysis — malicious · ac6cf8e099ba86a2

MALICIOUS

PDF

71.4 KB Created: 2021-03-10 22:05:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30

MD5: 4f44718b3325f604fee35f1b7f671e98 SHA-1: 02f4bfebde96f94ffd80b36b7d53603ad5741f98 SHA-256: ac6cf8e099ba86a2346fc30a10ad3525e3b41719bb74dab4ec5b75361cdb4317

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The document body, though heavily obfuscated, suggests a lure related to printer troubleshooting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or phishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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 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://nipisod.ru/aws?utm_term=brother+mfc-7860dw+printer+troubleshooting PDF link annotation
- http://sunshop.pro/easy_rum_cake_recipe_with_yellow_cake_mixlx943.pdfIn PDF document text
- http://filanion.online/apc_ups_battery_backup_br1500gygujm.pdfIn PDF document text
- https://gevexivojuler.weebly.com/uploads/1/3/4/4/134444242/3277148.pdfIn PDF document text
- http://tagaporigowekis.mygamesonline.org/ski_doo_repair_manual_free_download.pdfIn PDF document text
- https://cdn.sqhk.co/bidomutarili/chajjFS/raven_audio_nighthawk_for_sale.pdfIn PDF document text
- https://vunidiripoga.weebly.com/uploads/1/3/1/4/131453449/milise-wiguxuva-rikab.pdfIn PDF document text
- https://xevezuwojuko.weebly.com/uploads/1/3/0/7/130740392/68926b7c0.pdfIn PDF document text
- https://vipozuguru.weebly.com/uploads/1/3/1/4/131483083/nuxanakafabupikim.pdfIn PDF document text
- http://fezatubiwe.getenjoyment.net/ejemplo_de_guion_obra_de_teatro.pdfIn PDF document text
- https://wedabivugexum.weebly.com/uploads/1/3/0/9/130968949/merup.pdfIn PDF document text
- https://cdn.sqhk.co/fuwasokeg/igrifsS/xefanalesi.pdfIn PDF document text
- http://mscredit.info/gifiluvurujewaxebiwalelu5jdbe.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://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_9bd65b71e83e4856baa02e0890e06e0e.pdf?index=trueIn PDF document text
- https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_46458bd06c06406781ef965dc2c53954.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/kawotexulozax/ewi_recruitment_review.pdfIn PDF document text
- https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_4196b636fdfe481fac218e459ebb8356.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/pexodugosa/lekudoputanujazokerot.pdfIn PDF document text
- https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_8343048c554b4963869a29f79f86c88a.pdf?index=trueIn PDF document text
- https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_7915572ddb724f79b0f1046d7f9bcd09.pdf?index=trueIn PDF document text
- http://gixarewujedel.atwebpages.com/71316343054.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_off0000c91e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC91E	6124 bytes
SHA-256: `9d46ba86a3d77f3d9110ff9152d2a3c2b986d512d457fd540b873df2ffef42d6`
`font_01_sfnt_off0000ddec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDEC	10604 bytes
SHA-256: `6a3dc831e8516cbbbf2f440ced53eee6ad29e35bdfe65048257866283fc46c35`
`font_02_sfnt_off0001021d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1021D	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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