Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1465b88f2be99e0…

MALICIOUS

PDF

75.8 KB Created: 2021-05-08 07:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e1941e4b9a7dabe511df46a650862489 SHA-1: 49a56a4314327d26f1fe3e1cb9ca7291f24ac735 SHA-256: b1465b88f2be99e0a1f16df056ae462cfdf30bd2842a9487d35382fc44d0572d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO spam or phishing campaigns to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of external URIs and a link farm on disposable hosting further supports this assessment. No scripts were extracted, but the document's structure and embedded links point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=what+are+some+strange+phobias PDF link annotation
    • https://libuxematofep.weebly.com/uploads/1/3/1/0/131070581/68bf4b97b.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/tigCCrk/shadow_skateboard_apk.pdfIn PDF document text
    • http://tixivepemom.22web.org/emergency_medicine_fellowships_for_nurse_practitioners.pdfIn PDF document text
    • http://zimipodetasasa.iblogger.org/98814831076.pdfIn PDF document text
    • https://cdn.sqhk.co/juzurupivepo/ihzVbn9/demoxemifadubi.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/P3hihdL/72049940935.pdfIn PDF document text
    • https://cdn.sqhk.co/tofatuxurejo/hiT2hag/pearl_store_hawaii.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/ja8uagj/fireboy_and_watergirl_ice_temple_level_8.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/bjgETja/xipim.pdfIn PDF document text
    • https://xutepodufolesik.weebly.com/uploads/1/3/0/7/130739265/jomorububiker.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/DSFtSgi/10976526979.pdfIn PDF document text
    • https://cdn.sqhk.co/bunigenozav/HJYhagg/33446590579.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://s3.amazonaws.com/bidivo/hitchhiker_s_guide_thumbs_up.pdfIn PDF document text
    • http://kitosigefowo.epizy.com/pediatric_pneumonia_treatment_guidelines.pdfIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_e924e6fc61c8404985be88ab8f141635.pdf?index=trueIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_b458905a282c416baca7264d7d7e1323.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/29824246518.pdfIn PDF document text
    • http://puvewidu.epizy.com/93503356833.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/5515248833.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/canciones_cristianas_con_partitura_de_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/imprest_account_in_balance_sheet.pdfIn PDF document text
    • http://kefitiruw.epizy.com/sociology_optional_paper_2020_download.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.

FilenameKindSourceSize
font_00_sfnt_off0000e0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 5144 bytes
SHA-256: 37ba8098880ca652043b0532ecbee7b9ca52118d4929cc64291fec6d5bbf3c67
font_01_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 9740 bytes
SHA-256: a4913d80c34349555cc6ecebdd6688b425668ec6d03172966dbd973db3484c42
font_02_sfnt_off00011373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11373 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f