PDF malware analysis — malicious · 860f03cc11dfca70

MALICIOUS

PDF

80.3 KB Created: 2021-05-30 01:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 8e1b2e1767840ccce0570199aaf2d8fb SHA-1: c9d55f958735d1cf4197c83d9482b53ab0c1ef24 SHA-256: 860f03cc11dfca70dd57a8f0cfe65cdc8c5f1271eafc4e465cb82d5b8dd056c4

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary URL, https://golowaki.ru/123?utm_term=cleaning+service+agreement+template+pdf, is likely part of this scheme. No scripts were extracted, but the PDF structure itself is being used to host these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/123?utm_term=cleaning+service+agreement+template+pdf PDF link annotation
- https://wotuterivakevom.weebly.com/uploads/1/3/4/6/134608936/9194225.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426422/normal_603bf68c88cfb.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4459028/normal_5fc5db4c23fb0.pdfIn PDF document text
- https://desalipi.weebly.com/uploads/1/3/2/6/132681317/6482574.pdfIn PDF document text
- https://lapimirisa.weebly.com/uploads/1/3/4/3/134372347/gifojosu-rivasenis.pdfIn PDF document text
- https://mikiwugatuvul.weebly.com/uploads/1/3/5/3/135318334/relilofa.pdfIn PDF document text
- https://xavebebojemap.weebly.com/uploads/1/3/4/8/134848852/9903375.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4493569/normal_600ed881e3372.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://uploads.strikinglycdn.com/files/52a1f812-790a-4a7a-a7ef-e24dd1837452/pyar_jhukta_nahi_movie_mp3_songs_free_download_songs.pk.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/728f72ed-b088-4d71-8de7-9bbf1d4fab1b/zopatefegekikozegox.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/ae646a83-cbaa-444e-8004-0f13164c5895/viwowemowabodizaranaw.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/55d2cf47-fe29-42a6-ac65-8eeeceaba437/tezodasukovil.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/809d14fe-c576-44d3-94b9-5c2363d3a4c6/8115866294.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/4dc61278-aab2-4dd3-abf2-aa8296983bd7/99617691365.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e19bec15-19ce-4c86-af65-8848aa5facc5/wugawe.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/155ab810-144c-450b-b9d7-438e3f74f84b/sipamafijivekiwemuxuxexu.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_off0000f302.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF302	5236 bytes
SHA-256: `7476b147274be76edf5d5e50bd6558796f8dda00d9b7e8bc2c6d641220b08bb4`
`font_01_sfnt_off000104c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104C3	9696 bytes
SHA-256: `1d3903a9f0d2b5bbd68376216a6a28dee32e004c4852c7a7d77f3911713c91e7`
`font_02_sfnt_off0001260f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1260F	4324 bytes
SHA-256: `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`

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