Malicious PDF — malware analysis report

Static analysis result for SHA-256 d340e7ac2c28bade…

MALICIOUS

PDF

133.8 KB Created: 2021-05-25 10:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 20a944e756844e956db09871d1da380a SHA-1: d0160545de11dd9d936b9a59d8b7f05cca53388b SHA-256: d340e7ac2c28bade9750bb1104cdb1c5736ea38b99b3a9fe1c01541997c22a6f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'link farm' by heuristics, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs indicates a likely attempt to deliver a second-stage payload or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://dugedepap.ru/strik?utm_term=inductive+approach+in+teaching+grammar+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402246/normal_601a8266ab7b9.pdfIn PDF document text
    • https://watowerapomos.weebly.com/uploads/1/3/0/7/130775357/sajifudek.pdfIn PDF document text
    • https://mixusabap.weebly.com/uploads/1/3/4/0/134096097/6281105.pdfIn PDF document text
    • https://wegefaraza.weebly.com/uploads/1/3/4/7/134703567/xudavawewozudekola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_6021ef02977e0.pdfIn PDF document text
    • https://pulavirovedozas.weebly.com/uploads/1/3/2/6/132695401/pivep-vanonixogatig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453129/normal_6036a07dd6759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_60224d21985ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422620/normal_5feb18a879ae0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413462/normal_603d18c5cafa0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368782/normal_5fcbe14e2d3da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426085/normal_5fdbf77f3d37b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409114/normal_5fdddfb78de7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408858/normal_5ffe648183d7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/woneketelak/34178966484.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/42374206707.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/364511745.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/46057174376.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/weekly_diary_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/28535546542.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/3370872544.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_off0001b109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B109 5356 bytes
SHA-256: cea73319c1424c74e63ffdd808c0c9e17bbcb6cfa9d6e011573dc0148cbcef77
font_01_sfnt_off0001c322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C322 5880 bytes
SHA-256: 20ffd09ec2b1a5537800922a59e50ef091136965be9210e06f9e334d0e66cd1a
font_02_sfnt_off0001d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D98F 14600 bytes
SHA-256: 28e3ef8e3510b266e40945a6630e0e98506bdaa9801b712ec0670493a5a7e6ea

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