PDF malware analysis — malicious · 795becb31edb6c42

MALICIOUS

PDF

79.7 KB Created: 2021-03-27 16:51:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25

MD5: 15add19d93a73cae4db03c58d75f5ec4 SHA-1: 26d5cc681d755fdccdc0479846dc488da2ef9e4c SHA-256: 795becb31edb6c42be09e89d01773f878350f1b979b6027a14e69e6e067af731

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm with numerous external URLs, one of which is an SEO redirector likely used for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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://leonvi.ru/strik?utm_term=how+to+use+reusable+k+cup+in+keurig+mini PDF link annotation
- https://bojewozawix.weebly.com/uploads/1/3/4/3/134321988/06cf0d.pdfIn PDF document text
- https://kasugokadudibuk.weebly.com/uploads/1/3/4/7/134740653/lepezo_jixovewubudapa_tesexuweb.pdfIn PDF document text
- http://dekovag.mypressonline.com/pdf_to_word_converter_free_google.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4393359/normal_6008ac15d21b3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4470402/normal_601f232047ee2.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://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_15a6c7c37e234b8e8a801ff6c91d4465.pdf?index=trueIn PDF document text
- https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_a3be0d46684b4065a967b954dab7fa25.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/bejeseja/wotafedowusebedav.pdfIn PDF document text
- https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_93f102a6f3a544a09a7379c97f7bdf60.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/bajapovogam/conair_handheld_steamer_costco.pdfIn PDF document text
- https://s3.amazonaws.com/lazolu/29937945867.pdfIn PDF document text
- http://najukelosuned.myartsonline.com/el_poder_del_kabbalah_libro.pdfIn PDF document text
- https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_33132037f89e4891a657e5b11c71d5e2.pdf?index=trueIn PDF document text
- https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_b17c8f9c51224273b2f79e1b165cd745.pdf?index=trueIn PDF document text
- https://fb075467-9d00-46c6-93ac-2b777f5e584b.filesusr.com/ugd/8bcd66_537a45ab9f8d468486286f6a521c52fb.pdf?index=trueIn PDF document text
- https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_6325c06c444647ee84405ba07bf1866a.pdf?index=trueIn PDF document text
- http://nedizilunok.myartsonline.com/63172758231.pdfIn PDF document text
- https://s3.amazonaws.com/juzowilipi/33696992978.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_off0000e803.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE803	5392 bytes
SHA-256: `8defc24d179b72c9515f6c839d6f0eb56aa1903e3277eedf5dd88907593e9094`
`font_01_sfnt_off0000fa50.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA50	11616 bytes
SHA-256: `fe1d49dcd450d536d22cd29bc2c48118525d157db53a7e045979f7732eba1275`
`font_02_sfnt_off000121b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121B3	4324 bytes
SHA-256: `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`

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