Malicious PDF — malware analysis report

Static analysis result for SHA-256 099734a1361d053a…

MALICIOUS

PDF

101.1 KB Created: 2021-03-27 12:02:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: db382c0c07ffff61ee9af7e4eb5c2e8f SHA-1: cfad402b384940273accab78ddfc04a1a04e111e SHA-256: 099734a1361d053afde771f400b68caf7fc221c0846da2a587345be2a1c4e405
164 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and link farm attack. It contains numerous external links, including one to 'fokemale.ru', disguised as a free download for bank clerk books. The presence of a "Download" button lure further supports the phishing pretext. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://fokemale.ru/award?keyword=kiran+publication+bank+clerk+books+free+download+pdf PDF link annotation
    • http://jirafka.space/bury_a_friend_piano_sheet_musicooq1d.pdfIn PDF document text
    • https://lekomuge.weebly.com/uploads/1/3/4/7/134773229/zosififiv.pdfIn PDF document text
    • http://komarovskii.xyz/ralizumaziwukoj5inon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_6043edda7588f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_604f038d17dbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_601bf9ea88343.pdfIn PDF document text
    • http://domavera.ru/dofejosaseziduwex6ksmm.pdfIn PDF document text
    • http://cybety.xyz/european_history_textbook_online6syix.pdfIn PDF document text
    • https://zoletewiv.weebly.com/uploads/1/3/2/6/132695336/numikup_kevegufegupew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/bagisi/nipax.pdfIn PDF document text
    • https://34184745-b1ec-4725-b105-60c94cc90871.filesusr.com/ugd/63369f_346dd26bf1ad41b189c5ce5f1aa6511f.pdf?index=trueIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_1cb6b5fdf5f04420aa1874774ed6bc0a.pdf?index=trueIn PDF document text
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_4821bd08af074b00bec1ca4f10cc4e57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/4925120243.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/95347004949.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/cisco_ie-_3000-_8tc_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/ketosis_cookbook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/cghs_new_application_form_online.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/kofusiguzetikazikif.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF0 5296 bytes
SHA-256: ba6afce420e1ee52171629ee59e63acf446c7600649104257afc5150cd7ac2f6
font_01_sfnt_off00011cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF4 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00012857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12857 12024 bytes
SHA-256: fa27c956521d9281e6b1c9d1fcd445bc86b468e724504b398333e658d4e70e0f
font_03_sfnt_off000150c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
font_04_sfnt_off00015ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC9 11536 bytes
SHA-256: a4fb67fdf34f4387a2d06c1af265ee8ac686c51c4732712bbd9e283254127e5d