Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f14bc4a62b3f7d…

MALICIOUS

PDF

84.7 KB Created: 2021-03-31 03:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3fe14262a7910896700e93a9476c3bde SHA-1: 6ea1ac3551b465fc8750aeda3a1f548be6d53e6b SHA-256: 88f14bc4a62b3f7d12d62a2fd90a70eb8a87f61f64de8f8eec114a11a9429c1d
156 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 are to SEO-farmed content, indicating a likely attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://seumenha.ru/award?keyword=ms+excel+definition+pdf PDF link annotation
    • https://fuguxowaponiv.weebly.com/uploads/1/3/4/6/134648792/6510768.pdfIn PDF document text
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/79360dbc1a4.pdfIn PDF document text
    • http://tepumuranabida.iblogger.org/bobo_doll_experiment_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/PhNjbgh/calcium_citrate_liquid_form.pdfIn PDF document text
    • https://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/4133180.pdfIn PDF document text
    • https://lulotileja.weebly.com/uploads/1/3/0/8/130873917/4844244.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/45a9721c07.pdfIn PDF document text
    • http://numitofipepo.iblogger.org/xizidur.pdfIn PDF document text
    • http://bubuwem.iblogger.org/canadian_immunization_guide_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/iihgwjh/logitijunumopuxitadurilon.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/jepinebawo/half_cell_definition_chemguide.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/citroen_c3_2005_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/bodies_by_rachel_guide.pdfIn PDF document text
    • http://morinebasipu.rf.gd/ferrari_logo_drawing.pdfIn PDF document text
    • http://zisoramemib.rf.gd/maze_runner_1_book_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/21143305932.pdfIn PDF document text
    • http://vanomuwoz.epizy.com/riwilozasarenemotu.pdfIn PDF document text
    • http://galapeb.epizy.com/aruba_clearpass_hardware_datasheet.pdfIn PDF document text
    • http://rowemoki.epizy.com/28222633549.pdfIn PDF document text
    • http://sarozaxag.epizy.com/domavuxagisalatonetide.pdfIn PDF document text
    • http://jurorinidup.rf.gd/web_application_architecture_principles_protocols_and_practices_3rd_edition.pdfIn PDF document text
    • http://tifilumiteva.epizy.com/christian_brother_malayalam_movie_song.pdfIn PDF document text
    • http://puwomuf.rf.gd/xorularib.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_off00010c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6E 4916 bytes
SHA-256: e7d14a7771a3526a062991be29c0ad03ee6a117f61cd8d1d1f546b97bce39a91
font_01_sfnt_off00011d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D56 12276 bytes
SHA-256: cb94d4b07e38231647bbeb8002b7c89dcc6f39f3cccf7a1a2cf952dba5ee2ab5

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