PDF malware analysis — malicious · 43494fbffb11d8aa

MALICIOUS

PDF

82.6 KB Created: 2021-03-28 17:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23

MD5: 1a8566a55dc3bca7c956e603ba5acab1 SHA-1: 2a3cfd2a0c3c0ec4294656c09b8a3b7dd760f288 SHA-256: 43494fbffb11d8aa7e908e322dedbedaf67231bf14f7123651fdbc2955fcd958

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to a calendar file. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
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://crophysi.ru/award?keyword=lala+ramswaroop+calendar+2020+pdf+file In PDF document text
- http://gebiponakefijar.22web.org/lavender_blue_dilly_dilly_sheet_music_free.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4413973/normal_60432bf44d265.pdfIn PDF document text
- https://zunimivivonuz.weebly.com/uploads/1/3/4/0/134017399/ef2a03c53736db.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4482407/normal_6016ea2dbc9d5.pdfIn PDF document text
- https://cdn.sqhk.co/ridasozewe/D3Sgjdq/69552960123.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4417422/normal_5fcf2ca00bc7c.pdfIn PDF document text
- https://xigobiniliw.weebly.com/uploads/1/3/5/2/135298108/583138.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4500438/normal_6049b139c91fa.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4375341/normal_5fca8646e0888.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4464301/normal_602e429f4e01e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4476282/normal_605db685e4951.pdfIn PDF document text
- https://mukeluxera.weebly.com/uploads/1/3/4/5/134528716/9bd75c2c.pdfIn PDF document text
- https://cdn.sqhk.co/tulotunofuz/5Yifjh1/13409807689.pdfIn PDF document text
- https://cdn.sqhk.co/gotoruzud/XgdYuii/rixenodolijodekubuzosenof.pdfIn PDF document text
- https://cdn.sqhk.co/nobutowug/ird1haS/tanasak.pdfIn PDF document text
- http://soguged.22web.org/bubble_sheet_roll_near_me.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://donajiruxudila.epizy.com/80999422457.pdfIn PDF document text
- https://s3.amazonaws.com/pegozegi/huawei_p8_lite_android_6._0_frissts.pdfIn PDF document text
- https://s3.amazonaws.com/tuxexi/96646129345.pdfIn PDF document text
- http://pitepune.epizy.com/blank_instagram_template_2017.pdfIn PDF document text
- https://s3.amazonaws.com/nuxulikiwab/65351175366.pdfIn PDF document text
- https://s3.amazonaws.com/kafises/80829155466.pdfIn PDF document text
- https://s3.amazonaws.com/takateg/rosugedotipujetigogije.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_off0000f7a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7A4	5316 bytes
SHA-256: `3da5cee25fd21333e3b6f97ed49ae883526a5106cf357ecc6f8b184975900082`
`font_01_sfnt_off000109a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109A5	11476 bytes
SHA-256: `e5877b2900bd14413f541d0d7f30b5d4911ebe6cce3215c9746fe485514bde01`
`font_02_sfnt_off00012ed0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12ED0	4324 bytes
SHA-256: `d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378`

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