PDF malware analysis — malicious · 48af44374ed89eaa

MALICIOUS

PDF

87.6 KB Created: 2021-03-06 22:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22

MD5: 79f11f1fdbef3dfda5eab98268239bb7 SHA-1: d96ed2a137b4f88e9a39ac167ba86e9850a3790a SHA-256: 48af44374ed89eaac2430dd181ed336d1439ac2aed9e5a590c808c6b20ede5fa

222 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many of which are benign but one points to a suspicious domain. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as Pdf.Phishing.Trojan. The presence of a download button lure further supports a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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/strik?utm_term=how+to+write+an+ebook+cookbook In PDF document text
- https://cdn.sqhk.co/gufezitaxato/agfUV9J/snowflake_ipo_stock_price.pdfIn PDF document text
- http://ganilopafepe.iblogger.org/77318119132.pdfIn PDF document text
- https://cdn.sqhk.co/fepexeguma/eAcUnhb/12722773094.pdfIn PDF document text
- https://cdn.sqhk.co/sosexazefip/bgijcZ1/ice_cream_near_me.pdfIn PDF document text
- https://cdn.sqhk.co/tireronerogo/DMgcrje/idle_lumberjack_3d_weapons.pdfIn PDF document text
- https://cdn.sqhk.co/bovokolel/if5Oyja/lebakumek.pdfIn PDF document text
- https://cdn.sqhk.co/pepegizeso/fifjesN/32150628576.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
- https://uploads.strikinglycdn.com/files/1ddd7757-1141-4b54-924b-0cbad9064ce1/good_physics_lab_ideas.pdfIn PDF document text
- https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_c47cdb1b232c4856b4c1104d833094e7.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/vovuzize/vavufipatitonuwiwo.pdfIn PDF document text
- http://tumirukilifu.rf.gd/du_sol_2nd_year_form.pdfIn PDF document text
- https://s3.amazonaws.com/gosete/zomixubipulimidaxaduludep.pdfIn PDF document text
- https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_9300c9bf461c479f9d37a988188b7d08.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/gidibesuxi/nuragoxepufovawa.pdfIn PDF document text
- https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_72a114d9007e49879b255d472ce5e19d.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/xelimewat/chuyn_sang_nh_trn_my_tnh.pdfIn PDF document text
- https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_ce9b340a58f74aca98c3855082680574.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/sojuravewi/73914418747.pdfIn PDF document text
- https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_67cd44f80ec74af99eedf9d813fa59ca.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/e4532afe-ee2d-4935-88b1-2a938d94a13e/49203281406.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_off00010b8c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B8C	4628 bytes
SHA-256: `96b90da515df869fe6f00bafd469b05cc33ed13ce369135dfdb660d70ee46c9a`
`font_01_sfnt_off00011b5b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B5B	12228 bytes
SHA-256: `907e88c94d59337d4ed1bf83ae500aa46936bf643c21e7c27d16989595dedda5`
`font_02_sfnt_off000142fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x142FB	4324 bytes
SHA-256: `1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e`

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