PDF malware analysis — malicious · 9a5b829b37ee2974

MALICIOUS

PDF

77.9 KB Created: 2021-03-23 23:26:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24

MD5: 353d70f13ee376c03a9068a2ee7dcb08 SHA-1: 9f9f43e2130d0e38b6716def35f74e157c5219ba SHA-256: 9a5b829b37ee2974b0eb47d7b3a877fa1b863e9ca8b8ff4705ba0c01418d76a3

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://bologen.ru/123?utm_term=cyclopentane+chair+conformation PDF link annotation
- https://cdn.sqhk.co/mewivupa/YieP6fU/mypcom_pacific_college.pdfIn PDF document text
- http://s7hmus.org/ice_cream_truck_song_lyricsm12eu.pdfIn PDF document text
- http://afracheat5.xyz/18302710518on1ix.pdfIn PDF document text
- https://cdn.sqhk.co/susojitigi/dggheVq/vopenubutigikil.pdfIn PDF document text
- http://changely.club/python_tricks_and_tips7mx9g.pdfIn PDF document text
- http://particuliers-societegenerale.xyz/likert_scale_questionnaire_template_excelwvx33.pdfIn PDF document text
- https://cdn.sqhk.co/tititafoza/irjjhCH/57814447120.pdfIn PDF document text
- http://instgrmmverifiedbadge.com/maze_runner_3_film_streaming_itas1ntc.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/64336964-a203-40cc-8b7b-29695f21b432/xafifiwebajizubafupopa.pdfIn PDF document text
- https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_6d026b614a824158aee05f3dabae3597.pdf?index=trueIn PDF document text
- https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_59be639643714cf99dec0ddb3edc9183.pdf?index=trueIn PDF document text
- https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_a4240977eaf4476bbb7b95a7d12dea85.pdf?index=trueIn PDF document text
- https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_5c1ee628e41d49a49a867909fa252ea1.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/genijusemu/aamc_mcat_test_prep_bundle.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/8a404a23-002a-487f-83ba-fb4a77c49b51/anytone_at-5888uv_tri_band.pdfIn PDF document text
- https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_d88514f8fe4d4f809e0962fa715f49cb.pdf?index=trueIn PDF document text
- https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_1ee869760d5e44d8b03c5db37827010d.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/685f9334-13d7-45d9-a0d6-fb5fe0a28d60/5107541367.pdfIn PDF document text
- https://s3.amazonaws.com/tawosutosuxi/netflix_app_for_ipad_3.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_off0000e691.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE691	4988 bytes
SHA-256: `b9ab13ed7678a07261ea52cf943c2679a42ca7cb84bf29711c2ed0d10e6147bb`
`font_01_sfnt_off0000f755.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF755	10708 bytes
SHA-256: `269dee99e4a55b58a2c99b4e265036b8978fc83213e7cd63b59e8872f13617bc`
`font_02_sfnt_off00011bac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BAC	4324 bytes
SHA-256: `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`

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