Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba49e72cceb4b07…

MALICIOUS

PDF

83.9 KB Created: 2021-03-30 23:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c9788f9338000688c41506e847603057 SHA-1: 21f3f02efaf11bb96f8b75fabb9c7b18614a71f5 SHA-256: bba49e72cceb4b07206b22aab4689fc326f204e72263249ee4d32e1850601dab
186 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 0.9997

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=metformina+de+que+esta+compuesta PDF link annotation
    • http://static-start.top/injury_on_duty_report_form6b92i.pdfIn PDF document text
    • http://copyright-help-center.com/235401512500nh30.pdfIn PDF document text
    • https://folenepawesig.weebly.com/uploads/1/3/2/6/132680852/rotunitij_wumevaliros_fukukasabapa_dunikajugemij.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/giehbhe/nuzinapuzavigoluzam.pdfIn PDF document text
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/2949711.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/iafhcPs/15058446067.pdfIn PDF document text
    • https://cdn.sqhk.co/vijukifezu/fhiKxZb/wazajokepapedora.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/nuxowuw-nivol.pdfIn PDF document text
    • https://lokawerimi.weebly.com/uploads/1/3/0/7/130776865/dagekukub-gokewegoxozemib-zefomofuxutabe.pdfIn PDF document text
    • http://feelslike35.com/game_subscription_box_canada0qusm.pdfIn PDF document text
    • https://javexediwoxi.weebly.com/uploads/1/3/4/5/134584379/1698d9.pdfIn PDF document text
    • https://tubemugipowiw.weebly.com/uploads/1/3/4/3/134345788/nalixezoz.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwevini/8jQNhjg/civilization_revolution_2_free_download_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxokakijefe/Pgg8lYY/rurasonojaromizinefotumi.pdfIn PDF document text
    • https://mokonalu.weebly.com/uploads/1/3/0/7/130739423/lanulefisefamate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_a5c424c655ab4233bd641ebf6a4dec1b.pdf?index=trueIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_cc726883a22c4e6db8d510a6199760ce.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_2930f2831e2c4372815f18c8ec3c44fb.pdf?index=trueIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_62fe30d525fa4fe7a49dbd5bdf1f37b6.pdf?index=trueIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_82956b5dbda9495cb659cbe187dad4cd.pdf?index=trueIn 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_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 3304 bytes
SHA-256: 7db4aa9dcfc42b3a6ef9a04f555e0b2fea6a31cf0b1e3bf67d3f0cf3b72bc559
font_01_sfnt_off00010af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 5400 bytes
SHA-256: 1bcea6bd29f4380971be69a6a39d3b0ef206d7c54cb957ce291a530ce781dd4a
font_02_sfnt_off00011d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D46 10752 bytes
SHA-256: 31f3b926e1f9a0fc41776b70389b565308049c3bec7322849171b1d7919ada77