PDF malware analysis — malicious · 716899f9fdb18067

MALICIOUS

PDF

78.8 KB Created: 2021-05-31 04:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17

MD5: 5063077cd596b9776c125c0aa5314f31 SHA-1: 86fec0d675de42bd7d2aae4a8236e5f3004e4849 SHA-256: 716899f9fdb1806794907e53d986b3914ee4697bd91e1bc9c98ed7aaa242b5b6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged 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 PDFs hosted on strikinglycdn.com, suggesting a link farm or SEO spam operation. One of the primary external links directs to zajinet.ru, disguised as a search result for a seemingly innocuous topic, likely to trick users into visiting a malicious site.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wb?keyword=what%20are%20the%20origins%20of%20the%20american%20flag PDF link annotation
- https://cdn-cms.f-static.net/uploads/4387241/normal_602bf823663f5.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4489263/normal_6037ec54b7fc3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4419424/normal_605a5f7861276.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4372682/normal_5ff569724b79e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4381962/normal_60554afd5ce67.pdfIn PDF document text
- https://kugakisan.weebly.com/uploads/1/3/4/3/134390280/xinogerifu.pdfIn PDF document text
- https://doxipawuno.weebly.com/uploads/1/3/2/6/132682924/rokupifetum.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4445555/normal_60001756b573e.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4383128/normal_5ffb875a5b575.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/b88715c3-734c-46f2-9852-ed5603e5d252/how_to_read_audiometry_test_results.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/4b56a5cf-1732-4396-b29c-e0387a2b79aa/turom.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/3ebf9ba4-f018-43eb-9d60-8aa31f6d29da/how_long_can_a_champion_generator_run.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a0f93c6f-94f7-43bb-be34-ae7389aef18f/why_is_my_sunbeam_heating_pad_flashing.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/ad6f0e6c-cb7a-46cc-8700-a9c6e442a7ad/what_is_the_british_policy_of_indirect_rule.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/2fbe524d-27b8-445c-a8ee-4833f0776da9/how_to_get_rid_of_acne_scarring_naturally.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/83acf5b8-16a7-4013-952f-81c4427adf2f/cuisinart_bread_maker_cbk-100_manual.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1e587cd4-3696-482a-a126-5e7b37e29b9b/mepewipifewik.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d266b2e0-169d-4c46-8ab4-fee059b54f80/pojosevufe.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a9fbc0d6-ea72-4fff-98b4-8acb505c8d49/lista_de_verbos_irregulares_en_espaol_conjugados.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_off0000e793.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE793	5096 bytes
SHA-256: `9dd810c0131b0fa43bcb3a05fe9b0a707a1eca7dc4e27d1b2a40b3a733e36848`
`font_01_sfnt_off0000f8c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8C6	10836 bytes
SHA-256: `83f7fb98e237505e5ec51676809f4127e77d505f0355e7280821dc4738e6f07f`
`font_02_sfnt_off00011db4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DB4	4324 bytes
SHA-256: `ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c`

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