Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52d8c9c377f1336…

MALICIOUS

PDF

81.4 KB Created: 2021-03-24 16:02:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8d237e2f841b76cf913a00a43bdeb6d1 SHA-1: 118b093341b32a804cb21710800bc7beb5bea9e0 SHA-256: b52d8c9c377f13361af037abb753ec8b25ac958ac88d379f4f3bde23e0c7a8d9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification yielded a high probability of maliciousness. The embedded links likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://botokaw.ru/award?keyword=act+practice+tests+pdfs PDF link annotation
    • http://muzomabavima.medianewsonline.com/45123666102.pdfIn PDF document text
    • http://gugibugud.mygamesonline.org/67646608407.pdfIn PDF document text
    • https://gatokoliza.weebly.com/uploads/1/3/0/7/130739470/417308c547eb361.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/1cdfb23b6e6.pdfIn PDF document text
    • https://baxemajoxololur.weebly.com/uploads/1/3/1/0/131070692/pakagorusu.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/wheat_belly_recipes.pdfIn PDF document text
    • http://rebezun.mygamesonline.org/16075684570.pdfIn PDF document text
    • http://bafedudovodamo.medianewsonline.com/drinkwell_360_stainless_steel_pet_fountain_parts.pdfIn PDF document text
    • https://dawifibikinofi.weebly.com/uploads/1/3/4/6/134682228/6989016.pdfIn PDF document text
    • https://bixowupe.weebly.com/uploads/1/3/1/4/131409305/8272141.pdfIn PDF document text
    • https://zeteleginogegop.weebly.com/uploads/1/3/4/5/134526156/rubivutikazenep.pdfIn PDF document text
    • http://gibipimaxadebip.iblogger.org/96204435646.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_a4c3dedb1e614a7592076a7c9d7f8c7f.pdf?index=trueIn PDF document text
    • http://zevusup.atwebpages.com/solving_equations_and_inequalities_worksheet.pdfIn PDF document text
    • http://ropupifalapoges.atwebpages.com/47370526224.pdfIn PDF document text
    • http://momibur.rf.gd/4178604752.pdfIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_acfa99f4ee174f6b89c7eac1e88c0e48.pdf?index=trueIn PDF document text
    • http://bigapenegig.atwebpages.com/what_does_being_pregnant_in_a_dream_mean_islam.pdfIn PDF document text
    • http://gisawuvuxe.rf.gd/the_choice_book_nicholas_sparks_summary.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_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 5104 bytes
SHA-256: 8606c401ea6a7dc915baf15b75d777542d2edace3fd54b8409a3bca5aea457a4
font_01_sfnt_off00010fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEC 11444 bytes
SHA-256: 6613a4531d2d2a4fac62c041c6b775188b1eeaf827d802cc78d72e7de0fbc60d

Open this report in the interactive analyzer, or submit your own file for analysis.