Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23befd9f3347b0e…

MALICIOUS

PDF

82.9 KB Created: 2021-03-03 18:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7af5f8a5c9a9ce3eecfcdb87d56d8de2 SHA-1: 5caa27f4f0ac12d92f4483c956f565f1282433b6 SHA-256: a23befd9f3347b0e4ced4b6810f82120e7a8251f8c30bc8a87d3e593c2dc4f09
176 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 potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The SE_CALLBACK_LURE heuristic suggests a phishing or scam pretext. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/123?utm_term=the+white+princess+cast+members PDF link annotation
    • http://galajanexagaj.iblogger.org/18525063244.pdfIn PDF document text
    • http://pudirexuzil.iblogger.org/10756556199.pdfIn PDF document text
    • https://silajawa.weebly.com/uploads/1/3/4/3/134339193/8c7b8ce3dc1.pdfIn PDF document text
    • http://xetorobexojukas.22web.org/snow_teeth_whitening_kit_canada.pdfIn PDF document text
    • http://gegobalor.22web.org/best_baby_cradle_automatic_swing.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/25a4abc.pdfIn PDF document text
    • http://mefurolawexi.iblogger.org/how_to_use_a_maxiscan_ms300.pdfIn PDF document text
    • https://futibiwis.weebly.com/uploads/1/3/1/4/131408183/gulodusibumuxek.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/jejulurowev/krups_nespresso_machine_user_guide.pdfIn PDF document text
    • http://telatojewoka.epizy.com/el_dador_de_recuerdos_online_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/66302261804.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/ludenasurabo.pdfIn PDF document text
    • http://wikimenuvebiz.epizy.com/47944674132.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/answering_law_school_exam_questions.pdfIn PDF document text
    • http://xasitotimokines.rf.gd/tp_link_tl-wr841n_factory_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/277198498.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/pride_celebrity_xl8_mobility_scooter_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/tagepixukozifimivag.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_off0001058c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058C 5320 bytes
SHA-256: af010d3e77a4c8a982c58742c34672471c7d87cf59af64cbe5c396aba3ea9da3
font_01_sfnt_off00011789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 11496 bytes
SHA-256: 266990b086cbccffe3a32afe104193ffab98583a787b23ac599ed68c1a2bd38d

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