Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd65e3c95d73f681…

MALICIOUS

PDF

78.3 KB Created: 2020-12-24 15:33:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 59eadc5ee063dcbc8d6a5cfc9a9fc0cc SHA-1: 19b430baea2b622d9bbbdcc72bcce4dcba40f298 SHA-256: bd65e3c95d73f681ae15b956341a2503855aebdaaea15705fe0a7551d2923ba2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, indicating a link farm. One such link is to 'https://trafficel.ru/123?utm_term=200+verbos+regulares+e+irregulares+en+ingles+pdf', which is likely a lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?utm_term=200+verbos+regulares+e+irregulares+en+ingles+pdf PDF link annotation
    • https://cdn.sqhk.co/weteroliwo/RDJvnRG/run_run_as_fast_as_you_can_shrek.pdfIn PDF document text
    • https://bogatawokajo.weebly.com/uploads/1/3/4/9/134900502/dabegiximesava.pdfIn PDF document text
    • https://nobigezikol.weebly.com/uploads/1/3/4/3/134308489/f6070e4da490.pdfIn PDF document text
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/00db6a6a5ce141f.pdfIn PDF document text
    • https://nozigofomin.weebly.com/uploads/1/3/4/4/134481739/nagizamawawatudiwoso.pdfIn PDF document text
    • https://cdn.sqhk.co/weteroliwo/iczTMje/mibulinilalewofekudoludub.pdfIn PDF document text
    • https://cdn.sqhk.co/gulijolane/gghmcie/ninjas_infinity_2_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/balekunu/aig5NkJ/sofoxabonofelejubazagaxo.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/ifmNkcZ/18601961694.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/kotenu/95270182199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ebc3aa5-ea6f-491b-9bcc-eb93fbff7e99/88757240590.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/fajidotojolabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5eede2d-310e-49b5-9ccf-59870e353724/gelegofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2761dc3b-8b25-4352-971a-421e1b8655f6/how_to_make_a_mmd_model.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79111307-a16f-42d7-8082-42215c71f85c/45529343565.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_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 5588 bytes
SHA-256: 72027accd98336e1377026dc06b079bec9ae3fdc642ebaa7ba35dd04b4b2940b
font_01_sfnt_off0001035a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035A 11812 bytes
SHA-256: 2e63389697e133e816eb23b15446e5f6417b6c52bae9121d6bbf182c9286c608

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