Malicious PDF — malware analysis report

Static analysis result for SHA-256 4397784a81876ed1…

MALICIOUS

PDF

86.3 KB Created: 2021-04-07 20:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0f0cd16f6a7e4e18e7ea109e29f2e9db SHA-1: 0fa7e24721624ad72168ac6bfaf5d272ceca02b4 SHA-256: 4397784a81876ed178b246456e9283f9724dcb4c704a944d330edda830405a44
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm with numerous external links, many pointing to disposable hosting. The primary lure appears to be 'Yowhatsapp apk free 2018', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/123?utm_term=yowhatsapp+apk+free++2018 PDF link annotation
    • https://vafoguvisijun.weebly.com/uploads/1/3/4/8/134887412/f29be03d02aedd.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/dXihojc/86559198834.pdfIn PDF document text
    • https://cdn.sqhk.co/mofokamibe/8XE9jil/pojupukagamobikuk.pdfIn PDF document text
    • https://kemiponoza.weebly.com/uploads/1/3/4/6/134605011/b8d02b.pdfIn PDF document text
    • http://risizotifapeju.iblogger.org/wowivoxawimulonalerama.pdfIn PDF document text
    • http://nurigufasuvunu.iblogger.org/puweba.pdfIn PDF document text
    • http://foguwefo.iblogger.org/representation_of_peoples_act_2020.pdfIn PDF document text
    • http://fomuvegikutidob.iblogger.org/resumen_capitulo_11_metodologia_dela_investigacion_sampieri.pdfIn PDF document text
    • https://lefitujeledezov.weebly.com/uploads/1/3/6/0/136028835/9168691.pdfIn PDF document text
    • https://cdn.sqhk.co/worijekegir/efijbV0/citadel_forged_with_fire_xbox_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/oAdjhhf/fun_4th_grade_math_worksheets.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/bebbb4e6-b200-4a6e-b126-90cc9d5e6567/xupijinojemarufabebafufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51af018e-1578-44d6-add7-823ca6781b8e/magpul_gl_enhanced_magazine_well_glock_19_gen_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65c080c3-994f-43a8-baf7-a596a73f27fd/97756557424.pdfIn PDF document text
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_41cf444429a04da4840d9b69a62b6603.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da3411fc-2300-461c-9c1f-50229c534d82/white_ceramic_christmas_tree_with_blue_bird_lights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d485e6f-01e6-4256-b7d2-497e7dab7291/xubes.pdfIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_876085347ea4448195715d948c5f7a6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21cd630c-214d-4690-8fcd-8cd244828ed1/how_to_create_a_complete_wordpress_website_with_elementor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e7aad3f-bd87-4ab0-bb1c-ce58675b11c4/partituras_de_canciones_para_piano_famosas.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC16 5596 bytes
SHA-256: 2614f68bb221b1f2f9b4e905ae4196cc2e786fdf5539aee6628b813b028fed05
font_01_sfnt_off00010f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F33 11132 bytes
SHA-256: a34af360ae527695297e63d0fcbbe8feffceeebb30ac2a2ee2409676d99b2834
font_02_sfnt_off00013579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13579 16656 bytes
SHA-256: e42a7cccdef6191b2f49fe77108a37ab8c99e108ccc0a243006331e5fc5aa57d