Malicious PDF — malware analysis report

Static analysis result for SHA-256 607333fd521ec14b…

MALICIOUS

PDF

105.0 KB Created: 2021-05-23 19:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 666dd46fb5ba1b61864a860d312779e0 SHA-1: bf93ede14b7441f474ea10f59ec24d6c5ddb6a55 SHA-256: 607333fd521ec14b48344c8329d134bc939636940b2f6fb040f78b31c72f024a
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point to a coordinated effort to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/strik?utm_term=10th+social+science+xavier+guide+free+download+pdf+new+syllabus PDF link annotation
    • https://zodekunomaxuj.weebly.com/uploads/1/3/0/7/130739112/618513d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481273/normal_601dbd010e026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494673/normal_605682fe13fb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457320/normal_60503c6249393.pdfIn PDF document text
    • https://zonapabudaxaj.weebly.com/uploads/1/3/4/0/134017389/9f54609ef2.pdfIn PDF document text
    • https://kumevilowe.weebly.com/uploads/1/3/4/5/134598600/8076243.pdfIn PDF document text
    • https://pojikajuruwasi.weebly.com/uploads/1/3/2/6/132695468/5cbb4d6b11.pdfIn PDF document text
    • https://bosuzegenelulu.weebly.com/uploads/1/3/4/1/134131522/7857438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_604d0256e325b.pdfIn PDF document text
    • https://tagudosalanuku.weebly.com/uploads/1/3/1/4/131452811/fajuxinukewawi.pdfIn PDF document text
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/tupofijebuwexiguw.pdfIn PDF document text
    • https://janirakuvofubej.weebly.com/uploads/1/3/4/7/134734148/9eb23567.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cd1af7f-900e-4265-9f19-6df533a18914/stages_of_death_post_mortem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb1bb7d1-f9b2-4941-8b5d-cc22a41db693/nusine.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/67679031867.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/gemunafud.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/zigotarotowibawabobeju.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/batukudubibusogitome.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/rizarelurival.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/3460465758.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001189d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189D 5980 bytes
SHA-256: c4c36e97e41ff32a75cffecd28d83ecc103e58f5d09b7009c771fc78583f519b
font_01_sfnt_off00012d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D08 21968 bytes
SHA-256: 9ff707fae1c2a8188818fe100c0399a15a1a53911c5751d7fc9d00f9929f6651
font_02_sfnt_off00015b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B11 10884 bytes
SHA-256: ec1c68b4c1c4fcb5fc592089d0151cc0c6dc323c88e232b1f9cbc2b3a77dad56
font_03_sfnt_off00018033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18033 16164 bytes
SHA-256: 9fd30e00834769120a5ae23add2de2f07342b7c83eec7919148318ca25656f35

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