Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5cf04410d1f2ef…

MALICIOUS

PDF

84.9 KB Created: 2021-04-04 08:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 87d5b4367527bdde206df4ed6daa86a4 SHA-1: 213c36e4e8d981e2b89446a4fd78e60cf699bf0d SHA-256: 2a5cf04410d1f2efe3a716ba573f93f4c77c821f5dbc04b1234be3e2efb532aa
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/123?utm_term=last+christmas+alto+saxophone+sheet+music PDF link annotation
    • https://delularisif.weebly.com/uploads/1/3/4/4/134482541/leloxaloxikobu-doxapozifofabob.pdfIn PDF document text
    • http://submonster.xyz/electrolux_singapore_washing_machine_repairhmu7d.pdfIn PDF document text
    • https://xutogimumunode.weebly.com/uploads/1/3/4/3/134375265/8d0c3c13173896.pdfIn PDF document text
    • https://gojufoviwovefu.weebly.com/uploads/1/3/4/5/134515133/554e1bcdf69a4.pdfIn PDF document text
    • http://cosmeteca.com/ropaxabipigonusukol75l8g.pdfIn PDF document text
    • http://idealicacolumbia.site/how_to_clear_samsung_dishwasher_error_codes3xs9b.pdfIn PDF document text
    • http://cherrypimp.online/vezubodemogoguxixegak6q4wo.pdfIn PDF document text
    • https://donabetolemi.weebly.com/uploads/1/3/1/6/131637402/kezoxonebam-luwizit.pdfIn PDF document text
    • http://sberhome.ru/singer_tiny_serger_model_ts380azky1u.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/daniwodug/xevomoxegapusemunugu.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_e04d6223304e4ed9914e02dddc7ee6c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/puzodekonom.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_df21750e313945a38118e9b766b1b1c3.pdf?index=trueIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_5c4ec6d1c5f54fcab9a68bf8ee6e1675.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_15d91d25b8a24fc583a7cfa23b8118a0.pdf?index=trueIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_bd866705c7db4c7088dc5d6c475445fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/luwudutijimafano.pdfIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_4eb8d3e057914df08631c4a274f8157c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/android_developer_blog.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/51583666398.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/veterans_day_coloring_sheets_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/lobelawufefikog.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/which_laptop_is_best_under_20000.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_off00010313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 3312 bytes
SHA-256: a14950173e5d1d1f1c70576ac3dafa31bb0aa6ece26b8d12516862096ecff79f
font_01_sfnt_off00010ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF4 5180 bytes
SHA-256: 703461bb405576dcaef5716cde74af3f552f77165cc21abc6fd79e9295f03095
font_02_sfnt_off0001206e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206E 10792 bytes
SHA-256: 88f6b2e839652779a001f6f25506e36ef5b671d7fd0cb1dee0e55d6e92ba9d9a

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