PDF malware analysis — malicious · 81d7b97c70e071e6

MALICIOUS

PDF

69.1 KB Created: 2021-03-17 01:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21

MD5: 54ce76549174bb664f00d752e2174d23 SHA-1: 246ec85d2dbb09e7fcc8d4ba4183bec873de00ba SHA-256: 81d7b97c70e071e6437401e3c1dcb1dd11516d153b2b84467768b2ad658009f6

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a large number of external links, many hosted on disposable domains, strongly suggests a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used for redirecting users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

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.
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://vilenefex.ru/wix?keyword=wave+speed+calculations+worksheet+answers PDF link annotation
- https://kabezanaxojuzer.weebly.com/uploads/1/3/4/2/134234652/24faef4.pdfIn PDF document text
- http://xabiferego.iblogger.org/jaxufabumisokitew.pdfIn PDF document text
- https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/50e5a280584a59.pdfIn PDF document text
- https://linerebe.weebly.com/uploads/1/3/0/8/130813546/8078352.pdfIn PDF document text
- https://jazuwexakabe.weebly.com/uploads/1/3/2/3/132302764/5ee57a83af8d.pdfIn PDF document text
- https://bukivobiwizu.weebly.com/uploads/1/3/4/0/134097020/ffb92f.pdfIn PDF document text
- http://savupubib.22web.org/kay_jewelers_ring_size_guide.pdfIn PDF document text
- https://kijomexed.weebly.com/uploads/1/3/1/0/131069838/64261.pdfIn PDF document text
- http://gatorama.site/cadbury_nigeria_annual_report_2010_pcxd29.pdfIn PDF document text
- https://sadebisoj.weebly.com/uploads/1/3/2/3/132302749/f7a2438.pdfIn PDF document text
- https://daviwajid.weebly.com/uploads/1/3/4/6/134609730/e540c76c0fb36.pdfIn PDF document text
- https://safalijig.weebly.com/uploads/1/3/1/0/131070993/koverakurenov.pdfIn PDF document text
- http://hackins.site/g_switch_3_unblocked_games_33331c0o.pdfIn PDF document text
- http://jedufozares.22web.org/suwixasamalale.pdfIn PDF document text
- https://tadesurirow.weebly.com/uploads/1/3/2/7/132711952/3190871.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/sazomo/heart_beat_song_mr_jatt.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6e88dbb2-548e-4c70-89ee-af389228c225/greek_god_bookends.pdfIn PDF document text
- https://s3.amazonaws.com/dusined/labemosak.pdfIn PDF document text
- http://futivel.epizy.com/petty_cash_report.pdfIn PDF document text
- http://pogapebod.rf.gd/lowepu.pdfIn PDF document text
- https://s3.amazonaws.com/zifozujiwi/82087660796.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/034125f1-5044-4630-9395-ff3ff4a75e9b/buvifomakozurevufefoxumok.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/8284934a-bad4-4ca5-b1f2-8012eef0a8ee/python_programming_language_book_for_beginners.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d169.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD169	5388 bytes
SHA-256: `a594ed5045c914811778a16312007a934ecf9e74d7d8f7c3e4faaf12d83514ca`
`font_01_sfnt_off0000e3d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3D3	10244 bytes
SHA-256: `0a57e051a47e6582208a984ae09c22fa6424014d09e4ef83fb3704958c99dc69`

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