Malicious PDF — malware analysis report

Static analysis result for SHA-256 3edfccaa761f9c30…

MALICIOUS

PDF

68.3 KB Created: 2020-11-23 07:01:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b40e276a4a0ed7e234bffd117a467604 SHA-1: 4ff61341e6d107dcfd84ca40519c761aa49d747f SHA-256: 3edfccaa761f9c30dbcfaeb24acee42641b3d3a840280f523bc9c4deb66520ef
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains critical heuristic firings indicating it links to known malicious redirector infrastructure and a large number of external PDF links, suggesting a phishing or SEO-based malicious distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were extracted, the embedded links are the primary indicators of malicious activity, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/aws?utm_term=cattleya+orchid+care+pdf In PDF document text
    • https://sudiseva.weebly.com/uploads/1/3/4/4/134470115/kineremeragodedox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5f8de12eac336.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/widiku/connect_the_dots_for_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/paruwajidopulujifijiweno.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/baahubali_2_telugu_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/sea_animals_worksheet_elementary.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/ruvol.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/wodufubog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b91ab77-1cf0-4ed2-83f3-a9d6785dffbf/32701237313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55f6eaa0-99c5-4109-9335-b76c7cded58e/hotmail_com_sign_in_login.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/79094301038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/599d0962-64e9-4dda-b007-0aee599dc892/51237968928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88ef4cd4-b04e-410d-9ee3-d477adca7f50/16380947021.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_off0000cf5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5C 5072 bytes
SHA-256: 7500055ebd601f84ca9584bd553352faf6e0abcbefa12c85fce741abbbc40c8c
font_01_sfnt_off0000e09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 10672 bytes
SHA-256: dd2ec3e7bd1baff130112694315a1cc103c4d5df59cacb2e7a64c602bebc071b

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