PDF malware analysis — malicious · c5d26003603818da

MALICIOUS

PDF

79.2 KB Created: 2021-01-27 13:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15

MD5: 1b4c471f2d2877513bdf01005e400d76 SHA-1: eac0d37c5db58b0e77ee8b6722f4d5ff1c49f9cd SHA-256: c5d26003603818da4a2344a8dbd9241cddc99cfc76ba1eb1893807291c65be5c

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 to other PDF files hosted on various domains, indicating a link farm or a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or SEO spam campaign, likely leveraging embedded JavaScript for obfuscation or redirection.

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 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://maypoin.ru/123?utm_term=audio+technica+at95e+upgrade PDF link annotation
- http://chelamela.org/hide_and_seek_2019aeg5l.pdfIn PDF document text
- http://apsdd54gfv.xyz/rufamodezefiso0446h.pdfIn PDF document text
- https://cdn.sqhk.co/tajiwikiter/jhgcolk/latest_hollywood_action_movies_2018_free_download.pdfIn PDF document text
- https://fovozipi.weebly.com/uploads/1/3/0/7/130775458/dejevovujazitedomo.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4421224/normal_5feeb769183e1.pdfIn PDF document text
- https://rakonudiboxenej.weebly.com/uploads/1/3/4/8/134874851/maturuperolaxujuxu.pdfIn PDF document text
- https://puzagejezazi.weebly.com/uploads/1/3/4/4/134465952/8364031.pdfIn PDF document text
- https://wejigewaja.weebly.com/uploads/1/3/5/4/135400860/gekuxaduvokev.pdfIn PDF document text
- https://mogefitinovodug.weebly.com/uploads/1/3/0/9/130969954/6961203.pdfIn PDF document text
- http://iclod.tech/dingus_khan_mongoliant7wl1.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4477167/normal_5fd6000cb9c06.pdfIn PDF document text
- http://copyright-helps-team.com/46658497622pwjkk.pdfIn PDF document text
- https://fikobovivinuzo.weebly.com/uploads/1/3/0/7/130739062/dafogimadu_pubenora.pdfIn PDF document text
- https://vebunigujop.weebly.com/uploads/1/3/4/3/134367951/6138857.pdfIn PDF document text
- https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/nawebuwala-bagizip-verisaw.pdfIn PDF document text
- http://maddot.space/fojetuvimusogaggphoc.pdfIn PDF document text
- https://vedalamiru.weebly.com/uploads/1/3/0/7/130776143/sozuzawidori.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4389830/normal_6005e9e5016d2.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
- https://savannah.gnu.org/projects/freefont/In PDF document text
- http://www.gnu.org/licenses/In PDF document text
- http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e707.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE707	5392 bytes
SHA-256: `783b1a94af40925754285eab9832b9dbfb8220f95d624436d2975eedcf57b9b4`
`font_01_sfnt_off0000f91d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF91D	6364 bytes
SHA-256: `1bdb12399d76faa709a985205edf108cf776074ffae2a7b0eda646171f4c075a`
`font_02_sfnt_off000108b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108B8	11284 bytes
SHA-256: `8d30dcc2f135c05ae7cc9828886d07a0e4a1281643d9ba46611fa88db8020ecb`

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