PDF malware analysis — malicious · c44e001a019b6143

MALICIOUS

PDF

83.0 KB Created: 2021-03-20 01:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 3453173cce93b27da788df5912ba68a7 SHA-1: b1b39a216dd716b8b3163eaa77001a64e687735b SHA-256: c44e001a019b6143a47548fa30131b1e0c5dd160ff2d3c0fe43fb66497125a6f

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to link farms and redirectors, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly suggest this. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to malicious sites. The ML classifier and ClamAV detection further support the malicious verdict.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/award?keyword=incomplete+abortion+pdf PDF link annotation
- https://cdn.sqhk.co/kuwusemob/CeW8Yie/rimidozilitimonofitiga.pdfIn PDF document text
- https://cdn.sqhk.co/gedugari/iiitGjh/virtual_dj_dancehall_sound_effects_free_download.pdfIn PDF document text
- https://vetazewufa.weebly.com/uploads/1/3/2/8/132814418/8106568.pdfIn PDF document text
- https://xovipapapili.weebly.com/uploads/1/3/0/8/130873893/570e820c5.pdfIn PDF document text
- https://cdn.sqhk.co/javomekoru/ugeGijF/51178492186.pdfIn PDF document text
- https://cdn.sqhk.co/moxawitab/3hjnjb8/65404136297.pdfIn PDF document text
- https://cdn.sqhk.co/fefamuve/jj1lVhc/26273292501.pdfIn PDF document text
- https://cdn.sqhk.co/nexoratuxi/Mjdmhhl/kpmg_survey_of_corporate_responsibility_reporting_2015.pdfIn PDF document text
- https://cdn.sqhk.co/ketusugedi/c3hbggu/piguku.pdfIn PDF document text
- https://cdn.sqhk.co/pikevasoze/h9ieias/jopuvokorifijupav.pdfIn PDF document text
- https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/gakufolovolojibuju.pdfIn PDF document text
- https://zadopuvaja.weebly.com/uploads/1/3/4/8/134892734/f4618b6b94640.pdfIn PDF document text
- https://rezodipegizosif.weebly.com/uploads/1/3/1/6/131606434/4830430.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/1e0bda35-8be4-4293-bec0-cd327d7cc48c/how_to_use_mr_coffee_iced_tea_pot.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/124ed934-b66d-48fc-92f2-912939c869b9/69022880167.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e616.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE616	4988 bytes
SHA-256: `a22fdc831b7543f5e40525867fcbea90db3f727f81b49d53bc5b09a48209b815`
`font_01_sfnt_off0000f6d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6D7	10884 bytes
SHA-256: `eb012174d034ae89aa2a59db75cc422c2e12f059f4389d503fb3a466994f21c7`
`font_02_sfnt_off00011c52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C52	16060 bytes
SHA-256: `4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d`
`font_03_sfnt_off000130ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x130EA	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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