PDF malware analysis — malicious · a7bf200d67066a4c

MALICIOUS

PDF

66.9 KB Created: 2020-12-23 14:51:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26

MD5: 53728729df9031e404548312a7e01ef3 SHA-1: f4a69adc675d5119fd2addf64933f9bc6e45fe5b SHA-256: a7bf200d67066a4cae754872f8e661b1ad47c01a9a408f6098882fe34019fb5d

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to an 'Area of a polygon worksheet'. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious URLs.

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.
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://traffset.ru/123?utm_term=area+of+a+polygon+worksheet PDF link annotation
- https://zemonawajut.weebly.com/uploads/1/3/4/6/134688337/eb8fbe.pdfIn PDF document text
- https://zotolibufu.weebly.com/uploads/1/3/1/0/131069899/pejonaxunebiz_toxagesiwobokuw_juvazi_fewekuwipi.pdfIn PDF document text
- https://bilobusi.weebly.com/uploads/1/3/4/8/134872308/giwepituxedunelul.pdfIn PDF document text
- https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/nixezuwime.pdfIn PDF document text
- https://gudifikopar.weebly.com/uploads/1/3/4/6/134627505/b46ef7fcc.pdfIn PDF document text
- https://wumudirega.weebly.com/uploads/1/3/4/5/134515906/1822904.pdfIn PDF document text
- https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/9896139.pdfIn PDF document text
- https://fujubonutebi.weebly.com/uploads/1/3/4/2/134266124/gavamamad-larusanigefofiv.pdfIn PDF document text
- https://bizevino.weebly.com/uploads/1/3/4/3/134320064/750a30da174cfd.pdfIn PDF document text
- https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/3c840056.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/31813b7c-6fbe-4fc6-9115-016f6a915c18/83319920966.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/654ad4ba-500c-4083-9022-c22aff7ebb9a/lean_canvas_unfair_advantage.pdfIn PDF document text
- https://s3.amazonaws.com/gotitibekovi/98845658328.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/50582e36-25d5-4abb-a40f-4a43b2e7c843/arcadia_high_school_phoenix_calendar.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/916ebc88-7f3b-4244-9b0c-51fcfe03b686/relacion_hombre_naturaleza.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6e63ef60-deaf-4fb4-8265-49dafe22c665/cruisin_for_a_bruisin_pentatonix_sheet_music.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f5e9b469-15da-4d6e-b19e-3552ed4bdbb0/vojijezipazosipop.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/358149e2-e80e-4d61-8e84-0c9ec346812d/computer_networking_a_top-down_approach_7th_edition_solutions_github.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_off0000c962.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC962	5408 bytes
SHA-256: `85471d9d82b74c3a84de73a792b10020964e3166b9eeab6bbccb4a48275e2715`
`font_01_sfnt_off0000dbe3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBE3	10204 bytes
SHA-256: `9874e3c08e18aa8a766e5071ce5e5cd8f76928eec3b47c7bbd8903dc8de1bc72`

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