Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a67fba7f7238733…

MALICIOUS

PDF

92.7 KB Created: 2021-04-27 01:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 63dd07e0f7a4dbdaf62a0663e1bc0b8f SHA-1: 4c9820aef92eaa9f987e614b0e17d95cdefcbe1d SHA-256: 7a67fba7f72387339718c0bcc9fbb0ba5ac4e690bcb4fca5ebab221dcb1dccab
166 Risk Score

Malware Insights

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

The PDF document contains multiple suspicious links, including an invisible link to a domain designed to appear as a security alert. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/strik?utm_term=los+100+verbos+mas+usados+en+ingles+regulares+e+irregulares PDF link annotation
    • http://zeropium.com/63175992860qcfwj.pdfIn PDF document text
    • http://jafebidit.getenjoyment.net/cancer_de_mama_2020_mexico.pdfIn PDF document text
    • https://zavuvomexuwu.weebly.com/uploads/1/3/2/7/132740545/rutiri.pdfIn PDF document text
    • http://tadefog.medianewsonline.com/entrepreneurship_development_book.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/mDBniim/xezefevaba.pdfIn PDF document text
    • https://wakolixib.weebly.com/uploads/1/3/4/7/134706528/vurapepiz_mogobobozaru_tepaxi_tuforetew.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/EuhfUEQ/popular_ringtones_free_download_zedge.pdfIn PDF document text
    • https://talesana.weebly.com/uploads/1/3/4/8/134878252/510905bbd0e.pdfIn PDF document text
    • https://dililoperajat.weebly.com/uploads/1/3/4/6/134631443/bf9e53a265930e.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/ajhETgj/minerals_function_in_body.pdfIn PDF document text
    • http://musomojil.mywebcommunity.org/arbitration_act_no_11_of_1995.pdfIn PDF document text
    • http://lumogodasekepi.mypressonline.com/57995713182.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/cLZjjij/build_block_craft_survival.pdfIn PDF document text
    • https://rimibike.weebly.com/uploads/1/3/4/6/134636102/4cca72c9fc01ec4.pdfIn PDF document text
    • https://wevetajapejo.weebly.com/uploads/1/3/4/6/134636724/2676666.pdfIn PDF document text
    • http://idealicaitalia-official.site/drama_triangle_bookxc56m.pdfIn PDF document text
    • http://auth02mobility.com/kebudixowinowenisybb7i.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/marta_etxebarria_de_asteinza0virq.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/hbkiihg/84957038948.pdfIn PDF document text
    • http://olymp-trade.top/roserudurarouop92.pdfIn PDF document text
    • https://relujebaxarun.weebly.com/uploads/1/3/1/1/131164257/2360601.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/ef0d4e4e-80ee-4616-9287-1c6d2ed87104/adventures_of_tom_sawyer_story_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36253f99-e139-4890-b5b2-1cff07634ccb/best_way_to_start_dd_campaign.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a763539-1ffb-43b3-a74b-6d0840eeb5d5/dakuruxatabit.pdfIn PDF document text
    • http://koriwironawuva.myartsonline.com/67517405300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b4f1c8-2f8a-4047-bc3f-dd9cfa4348d7/what_killed_annabel_lee.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.

FilenameKindSourceSize
font_00_sfnt_off000128b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B1 5480 bytes
SHA-256: 286065c9be6137d10a3c73029e2765510d939dc2dc9202f576ea897c55e7964f
font_01_sfnt_off00013b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B48 12060 bytes
SHA-256: c00da5ff5086647eeb566fc99af03081f2c85a7f423fe45f2d5d4cf391ef9ce7