Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fe480f1f7965a4…

MALICIOUS

PDF

75.6 KB Created: 2021-01-24 01:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1a4aa0f9f07960c1ce21d9f5417ac10 SHA-1: d4815e9cb9d3a5493c0d95771cdfac9b8d3d7f8e SHA-256: a1fe480f1f7965a42f14a3f14d262ff218646a6bd4a970add9613e65f108108c
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 point to SEO-optimized PDF hosting sites, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=punctuation+marks+quiz+with+answers+pdf
    • http://xodikiz.iblogger.org/marguerite_duras_l_amant.pdf
    • https://site-1179585.mozfiles.com/files/1179585/field_study_5_learning_assessment_strategies.pdf
    • https://lovaxases.weebly.com/uploads/1/3/4/6/134685664/a8d8c87ea7086.pdf
    • https://site-1173985.mozfiles.com/files/1173985/borohydride_reduction_lab_report.pdf
    • https://jizimixu.weebly.com/uploads/1/3/4/0/134095846/3b194c0b1fd64.pdf
    • https://gokuxevi.weebly.com/uploads/1/3/4/0/134017514/jinebimi-penugekikegepix.pdf
    • https://gapotijaj.weebly.com/uploads/1/3/1/3/131383657/modedu.pdf
    • https://gilamasizate.weebly.com/uploads/1/3/0/7/130775108/pomuzoxagafamar_vunutuzi_fawamovavadez.pdf
    • https://kasutuwisuruja.weebly.com/uploads/1/3/1/8/131872017/ximalobetepoxu.pdf
    • http://kewisanoxiv.66ghz.com/coraline_neil_gaiman_book.pdf
    • https://site-1177836.mozfiles.com/files/1177836/envato_themes_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lemefofutomapox/ibps_lic_admit_card.pdf
    • https://s3.amazonaws.com/sosupejuxofedo/6426113011.pdf
    • https://s3.amazonaws.com/kufazete/kendriya_vidyalaya_online_form_for_class_1.pdf
    • https://s3.amazonaws.com/difigomisosak/simple_contract_agreement_form.pdf
    • https://s3.amazonaws.com/dejazuvorira/bpsc_40_bcs_admit_card.pdf
    • http://begosene.epizy.com/smd_capacitor_value_chart.pdf
    • https://s3.amazonaws.com/wiwamoxamo/xiramew.pdf
    • https://s3.amazonaws.com/susonanezaj/dynamics_ax_2012_costing_sheet_setup.pdf
    • https://s3.amazonaws.com/jojitagifuva/double_digit_addition_worksheets_1st_grade.pdf
    • https://s3.amazonaws.com/tosevud/1121279571.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df66.bin
a17f77d21da1f5f2baeaaf97ab60912ea0e4c8cb393c99b286d0abca0aa9bbfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 5696 bytes
font_01_sfnt_off0000f2b0.bin
7cd63ea236a3a6d34ee5cfcf5f2ed40bd3c4c6d914ea15b4ac01f3e62163efdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 2032 bytes
font_02_sfnt_off0000fc40.bin
1fa37de9f754fdde2b3c9d81627d0a3cbf9bda3abb48b867b854695c8b37b50d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC40 10580 bytes

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