PDF malware analysis — malicious · 9d665f5d12ebad20

MALICIOUS

PDF

78.7 KB Created: 2021-04-05 00:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 6b54355e088cb3597de3fb8c8a169604 SHA-1: b38caa503d9e5d93a36425f6133429b4ead4a19e SHA-256: 9d665f5d12ebad20cb046dc6ec127cb8f670fc98f8a89504df3045300c253ac2

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which point to other PDF files, indicating a link farm or phishing attempt. The document body, though partially corrupted, suggests a lure related to 'Stranger Things piano sheet music'. The presence of PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK heuristics, along with ML and ClamAV detections, strongly suggests malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution scheme.

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://bologen.ru/strik?utm_term=stranger+things+piano+sheet+music PDF link annotation
- http://lazakefezives.mygamesonline.org/angielski_wiczenia_czasy.pdfIn PDF document text
- https://jewupoma.weebly.com/uploads/1/3/1/4/131437657/4855169.pdfIn PDF document text
- http://zagavexakagin.mypressonline.com/can_i_study_for_the_gmat_in_one_month.pdfIn PDF document text
- http://medazuxa.mywebcommunity.org/garmin_920xt_manual_portugues.pdfIn PDF document text
- https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/vixironoputu.pdfIn PDF document text
- http://forisawidokomor.sportsontheweb.net/10044465319.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://zenuwosa.epizy.com/neurontin_100mg_capsules_information.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/83504ff4-0d55-4b46-bfdf-5eafebe5e5f2/nunojuzuza.pdfIn PDF document text
- https://s3.amazonaws.com/jefobexapulow/cunto_tiempo_tarda_en_cicatrizar_una_herida_por_dentro.pdfIn PDF document text
- http://rodaselawowov.rf.gd/dofe_assessor_report_template.pdfIn PDF document text
- https://s3.amazonaws.com/nowokil/11657800787.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/ec3e7346-3202-448c-a70f-86d383de4eef/al_quran_al_kareem_word_by_word_translation.pdfIn PDF document text
- https://s3.amazonaws.com/zodawanuror/86873292256.pdfIn PDF document text
- https://s3.amazonaws.com/zagapaxa/47809401302.pdfIn PDF document text
- https://s3.amazonaws.com/nelizenejakarug/77449447732.pdfIn PDF document text
- https://s3.amazonaws.com/jirebonudur/debodezasozifafeser.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/43dd4797-2ebf-42f6-9763-08c9e226ff16/detozejitupuwulis.pdfIn PDF document text
- https://s3.amazonaws.com/vifusupegiza/dbt_skills_training_handouts_and_worksheets_second_edition_online.pdfIn PDF document text
- https://s3.amazonaws.com/zibenoroduzuw/54788198947.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_off0000e8ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8BA	5300 bytes
SHA-256: `d28a687358a07bdcd221baee1fa24dd6a7b06065bc05dee86fd178341319fbd2`
`font_01_sfnt_off0000fa84.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA84	11016 bytes
SHA-256: `8abffd6566869956ea56ad9973edbcfee62fda4714c86b4eb98bdbae680e569e`
`font_02_sfnt_off00011f9f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F9F	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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