PDF malware analysis — malicious · ec2e034fa36b3a15

MALICIOUS

PDF

79.6 KB Created: 2021-04-04 02:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25

MD5: b9b92b4a7c8e3d5ec7faabd8b8018c90 SHA-1: d33505a407e39bff739848131b6645b3a4042a48 SHA-256: ec2e034fa36b3a15be749e5ba4f10f0d475b69b7dd2b41eb2afa24951313acf1

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious content. The primary redirector URL, 'https://golowaki.ru/award?keyword=equifax+free+credit+report+pdf', is presented as a lure for a free credit report, indicating a phishing attempt. ClamAV detection and ML classification strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further payloads.

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.
Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK

PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
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/award?keyword=equifax+free+credit+report+pdf PDF link annotation
- https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/48de97796c573.pdfIn PDF document text
- http://teren.fun/esv_chronological_bible_reading_plantkz5u.pdfIn PDF document text
- http://tobufupevujuma.mygamesonline.org/how_do_i_connect_my_hp_photosmart_d110_to_wireless_network.pdfIn PDF document text
- http://gta-msk.ru/5th_edition_monster_by_crg6qgc.pdfIn PDF document text
- https://jadafuvirop.weebly.com/uploads/1/3/2/7/132710722/rimuwojuludedi.pdfIn PDF document text
- http://riwotivadejud.sportsontheweb.net/magic_tree_house_merlin_missions_1-4.pdfIn PDF document text
- https://cdn.sqhk.co/wezikinupig/jaLOrn5/kutir.pdfIn PDF document text
- https://figerifefiter.weebly.com/uploads/1/3/4/3/134343277/c5f775bc18.pdfIn PDF document text
- https://cdn.sqhk.co/devisojop/jhDjcgh/tribe_archipelago_lxc_presets.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://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_36e644c8ed68486989b1e893f689d433.pdf?index=trueIn PDF document text
- http://fixidil.atwebpages.com/a_wrinkle_in_time_book.pdfIn PDF document text
- https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_b4e05b453dfe4143a608f9b09f2a9f61.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/novifamigot/kenwood_kdc-hd262u_faceplate.pdfIn PDF document text
- https://s3.amazonaws.com/xujitezu/25024606672.pdfIn PDF document text
- https://s3.amazonaws.com/godewumazek/how_to_use_formula_to_calculate_days_in_excel.pdfIn PDF document text
- https://s3.amazonaws.com/xunilukegez/storylineonline_rainbow_fish.pdfIn PDF document text
- https://s3.amazonaws.com/fezenur/bsc_manchester_formerly_manchester_academy_of_english.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_off0000eee1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEE1	4868 bytes
SHA-256: `4642350330c83f31de1fe433230a4fec02c40ef8ebba93cf29e1a677ec667d53`
`font_01_sfnt_off0000ff89.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF89	10540 bytes
SHA-256: `728e4ac39368fd6c8583de3d0c67ebe5174e6aad6c5289e6e0c4879bee6fdf06`
`font_02_sfnt_off00012384.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12384	4324 bytes
SHA-256: `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`

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