PDF malware analysis — malicious · 5a61b91579d1a5c0

MALICIOUS

PDF

79.6 KB Created: 2021-04-12 01:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02

MD5: 402d6fba3b540f8e8aee7e654d248d1e SHA-1: 1d03e3174f862301c128fc90dff1e112190fba03 SHA-256: 5a61b91579d1a5c06c403169df8b4e089b82e78ea689d637a0e8113cf026d125

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The malformed stream length heuristic also points to exploit activity within the PDF structure.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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
Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH

A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
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://botokaw.ru/strik?utm_term=project+x+lz+shaft+reviews PDF link annotation
- http://curvepreloved.com/pimuzowevx8onw.pdfIn PDF document text
- http://samafutanub.mypressonline.com/cengage_physics_bm_sharma.pdfIn PDF document text
- https://xidaxawefitorat.weebly.com/uploads/1/3/5/9/135958331/5399314.pdfIn PDF document text
- http://money-team.site/71307504849tnvuq.pdfIn PDF document text
- https://cdn.sqhk.co/kutajanode/Nif1Vgc/jusokerematoxalufived.pdfIn PDF document text
- https://todusoxi.weebly.com/uploads/1/3/3/9/133999566/6919629.pdfIn PDF document text
- https://cdn.sqhk.co/bitizulokiva/jeidZib/extinction_definition_in_a_sentence.pdfIn PDF document text
- http://lynciguest.com/healing_is_voltage_healing_eye_diseasesiktzd.pdfIn PDF document text
- https://ludutuwe.weebly.com/uploads/1/3/4/6/134687162/gosuwovejonore.pdfIn PDF document text
- http://studyweb.site/38558842184s54pv.pdfIn PDF document text
- https://cdn.sqhk.co/jifigetuxu/dvqcvbz/minecraft_2._0_download_mac.pdfIn PDF document text
- http://shtangelkipokupkiitd.online/wiluxudenetuzixofofadaxt26sd.pdfIn PDF document text
- https://fanepolareroroz.weebly.com/uploads/1/3/4/6/134666972/240752.pdfIn PDF document text
- https://cdn.sqhk.co/zotofoza/wgh9mGW/music_player_for_windows_10_and_android.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
- http://sojufuka.atwebpages.com/xakirisu.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/47bb2597-d5be-4081-9c37-dff6c2d8dfab/95823064282.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/3f799e1c-99db-4641-ad84-8bb8c9faf226/microsoft_excel_chart_templates_free_download.pdfIn PDF document text
- https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_dd1cf413aaf7454b9b4c70ca3c6a7d0c.pdf?index=trueIn PDF document text
- https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_ce7af5e3abbe48a88999bfbb7186ea4d.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/9a217907-9f5f-4a5b-8039-26bc35561b59/sadefexuvulerile.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_off0000ecbf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECBF	4996 bytes
SHA-256: `523646c6a85e2b3a921cf37fe5c60eeb007cb3211a476379f4d9fbfc20bf6525`
`font_01_sfnt_off0000fdee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDEE	10932 bytes
SHA-256: `2b0bc78c43961b33595cefebe9a183e2709ead2143b213b764adb57d54d5565d`
`font_02_sfnt_off00012354.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12354	4324 bytes
SHA-256: `7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71`

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