PDF malware analysis — malicious · c17479cd22b49f9e

MALICIOUS

PDF

88.0 KB Created: 2021-04-03 02:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02

MD5: 071a7cbe8762a6d576326f6cc8ab3bac SHA-1: 2d2bdc5b7f6f6b5456ec9c73e97006592f7adf28 SHA-256: c17479cd22b49f9e5a7517fd70964c6668ef5bdcfe828d6f2847dbf6afb16f33

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

Heuristics 5

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 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://leonvi.ru/award?keyword=application+letter+for+work+immersion+pdf PDF link annotation
- https://static.s123-cdn-static.com/uploads/4419626/normal_5fe02afde233e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4470535/normal_6066e6f0df47f.pdfIn PDF document text
- http://delozofize.scienceontheweb.net/losartan_mechanism_of_action.pdfIn PDF document text
- http://zotusomadelisok.22web.org/initial_mental_health_assessment_template.pdfIn PDF document text
- http://nijalatol.mypressonline.com/73270087146.pdfIn PDF document text
- http://toredakaf.22web.org/what_exercises_work_the_gluteus_medius.pdfIn PDF document text
- http://zewugivufo.22web.org/all_the_bright_places_ending_spoiler.pdfIn PDF document text
- http://zumewidife.mygamesonline.org/brs_behavioral_science_7th_edition_download_free.pdfIn PDF document text
- http://ziwigosopijulal.mygamesonline.org/68313616369.pdfIn PDF document text
- http://xoxosedefoxadu.mygamesonline.org/pesenokabitupajego.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4427267/normal_6066febeeeab6.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4482027/normal_60366a65a07cc.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://vigogogakuza.epizy.com/jowapimobulixaferud.pdfIn PDF document text
- https://a539eca0-ed6d-4e39-a9fd-63162facd464.filesusr.com/ugd/8170ee_8cecb67922834b10b99aeb81dcd86693.pdf?index=trueIn PDF document text
- https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_c7a3697d5b1d44a19e038ded7e64243d.pdf?index=trueIn PDF document text
- http://rukosivujuxu.atwebpages.com/59644236008.pdfIn PDF document text
- https://s3.amazonaws.com/gowebabuxogiro/87359128411.pdfIn PDF document text
- https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_edce91a3f024429ab7a26c80f74328e3.pdf?index=trueIn PDF document text
- https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_380a698592754d89ab77ea6e222430ff.pdf?index=trueIn PDF document text
- http://ketabigumowun.atwebpages.com/92606944773.pdfIn PDF document text
- https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_3d1f0b8f71744ebab385a628db943910.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/dowavelaxam/how_to_get_jersey_mikes_points.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_off00010e52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E52	5232 bytes
SHA-256: `825cc6ca6b3fbb259278e1cf562fd4e575b7c43df8287460a60c28ec1af39699`
`font_01_sfnt_off00012010.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12010	10664 bytes
SHA-256: `de184cbb362e4f32b83700c149d613507501a8b80be1c2126d2d6f2b1b3ad67b`
`font_02_sfnt_off0001444c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1444C	4324 bytes
SHA-256: `1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e`

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