Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b060bb33b5970df…

MALICIOUS

PDF

69.8 KB Created: 2021-02-15 20:32:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ea441604c0479edb41d5f032e3bd20d4 SHA-1: 237e4e0f52f40b84969e5456cbd6ab8bf5a4cbb5 SHA-256: 1b060bb33b5970dfd2fe445e49e6e0fe0ac7a0456f870a9ad970c3c41d62cdd7
246 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm, and is flagged for brand impersonation phishing, specifically targeting Costco. The presence of a malicious ML classification and ClamAV detection further supports its malicious nature. The document's purpose appears to be directing users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://jumomemokipus.weebly.com/uploads/1/3/0/8/130874307/39a8ade.pdf.
  • 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://maypoin.ru/strik?utm_term=transfer+mini+dv+to+dvd+costco PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378608/normal_601f9a56aaf4e.pdfIn PDF document text
    • http://azorocheat6.xyz/dexabojobidezikepuvegiic3n1.pdfIn PDF document text
    • http://mmamba.ru/32283637812syq05.pdfIn PDF document text
    • http://myimperfectmomlife.com/93869763876rjphg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_6028a801702d8.pdfIn PDF document text
    • http://vuvuga.xyz/import_xml_file_into_excel_sheet48egz.pdfIn PDF document text
    • https://jumomemokipus.weebly.com/uploads/1/3/0/8/130874307/39a8ade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418197/normal_6023fcb0aee2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385021/normal_601e464b1c475.pdfIn PDF document text
    • http://3203epworthcres.com/series_66_dump_sheets49gt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5fc672b274a32.pdfIn PDF document text
    • http://vovpomnim.ru/7853179079720t13.pdfIn PDF document text
    • http://modernstyle.pro/jorinexoxubawofod6qzb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447450/normal_5feb1b49a8ec7.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/fizup/indian_oil_sustainability_report.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/41804443309.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/lilalesofafemejav.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/business_flyer_template_free_vector.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_off0000d414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD414 5144 bytes
SHA-256: 38d0ab23364e9de258ff98768f810fa16b5748f423f0850a32ae7533997462d5
font_01_sfnt_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 10720 bytes
SHA-256: 2699b8a1501bc73143c36e44b6e079d686f6eba0f72518a45a70fb3c0583a63c

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