PDF malware analysis — malicious · 8b85bad9ed6e05ef

MALICIOUS

PDF

85.7 KB Created: 2021-04-12 08:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23

MD5: 298fbd6044554d0528df934218939671 SHA-1: 2e01f6c1ff43b0b9bff7dbf61a52c0125addb391 SHA-256: 8b85bad9ed6e05ef0d814faa293432a70ea60dc7ff3c83017defdd8d42744bc8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external links, many of which point to PDF files, suggesting a link farm or redirection mechanism. The embedded URLs, such as 'https://druttle.ru/strik?utm_term=learn+english+vocabulary+in+hindi+pdf', are likely used to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a phishing or scam attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 5

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.
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://druttle.ru/strik?utm_term=learn+english+vocabulary+in+hindi+pdf PDF link annotation
- https://cdn-cms.f-static.net/uploads/4501385/normal_604848e06cd5e.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4422144/normal_6002c2b824e0c.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4453550/normal_6006598d8247b.pdfIn PDF document text
- http://zonagareme.getenjoyment.net/dekaragogogivubefojepa.pdfIn PDF document text
- http://ruregere.sportsontheweb.net/the_art_of_reading_body_language.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4421641/normal_602cae6e41c3a.pdfIn PDF document text
- https://xedagiwaki.weebly.com/uploads/1/3/1/8/131856626/jutidebumu.pdfIn PDF document text
- http://kerutugizuxig.mygamesonline.org/how_many_carbs_in_large_dunkin_donuts_coffee_with_cream.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4493201/normal_5fff733b62fad.pdfIn PDF document text
- https://bawidonawasaz.weebly.com/uploads/1/3/4/3/134354070/5616883.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4480187/normal_601fdd01c69f6.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4393632/normal_5ffe54774626f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4421207/normal_5fd9e3f49317d.pdfIn PDF document text
- https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/4058124.pdfIn PDF document text
- https://leresidatebij.weebly.com/uploads/1/3/0/7/130776374/zofarefilo.pdfIn PDF document text
- https://mumilupoj.weebly.com/uploads/1/3/5/3/135351188/sedexakaberoz_nuzosilegemu.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4446280/normal_6004d243165a5.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://fedorahosted.org/lohitIn PDF document text
- https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_7c57ff744b16489096955fa743914100.pdf?index=trueIn PDF document text
- https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_401118b18be7456ea1f2ee991d05d94d.pdf?index=trueIn PDF document text
- https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_9b172460f4b8451e90ba3c12c0ae0656.pdf?index=trueIn PDF document text
- https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_748a55741cab42669850cf0a1f71a883.pdf?index=trueIn PDF document text
- https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_3e2cd47f0a534dbe9bed8bdf519424c1.pdf?index=trueIn 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_off0001043a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1043A	5660 bytes
SHA-256: `7ef88e52c7d2228efc861c2b3ad2fb0cf95c306ca8834a16d36c846b91f01a00`
`font_01_sfnt_off00011785.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11785	10992 bytes
SHA-256: `951e74f7ebf62224016fe6f2e3b3c38d87471693ab2e97e5c9217cc8431bcf2c`
`font_02_sfnt_off00013bd9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13BD9	3316 bytes
SHA-256: `c0b61b15a31397638faf51f5d66076fc0c3e262c451f424314f49fb29a816dd9`

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