Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bcbb82377ac9b45…

MALICIOUS

PDF

67.7 KB Created: 2020-12-27 09:05:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 35370c4f1f17571e7be6594828b3104e SHA-1: 91149cfbae6a4acc278a047ce62f5b59f58b174d SHA-256: 7bcbb82377ac9b45b7e32061160fab6851fdeec039c85d5690d035961eacf92b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to "https://traffmen.ru/aws?utm_term=heart+failure+guidelines". The document body, though heavily obfuscated, contains text related to "heart failure guidelines", suggesting a lure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://traffmen.ru/aws?utm_term=heart+failure+guidelines In PDF document text
    • https://static.s123-cdn-static.com/uploads/4381297/normal_5fcc9efac87d5.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/hfZGoLF/wazaramofalumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380382/normal_5f96456019cd2.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/hjjghjU/nixabopugiziwipawusilot.pdfIn PDF document text
    • https://cdn.sqhk.co/zevivovakok/hd8Tii9/orange_tree_resort_in_scottsdale_az.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/25de9092-3a68-4f38-aa71-b1dd6d5b7cc5/39180420176.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/coins_gain_8_ball_pool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9784911d-4544-48a7-8561-92e8af9e8d93/koala_bear_baby_in_pouch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22f4bf59-3076-4c14-894f-61a439aa1727/digatepizikiwexinuriji.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/18838130665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84fa7e51-fa90-4c98-9182-5de4dc00a1b9/mikojonanuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e7ab561-1a51-4ef1-a38f-70927a19fbd0/86683792988.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_off0000cfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA7 5036 bytes
SHA-256: e3452760197f1d1e796a190a1a624a6e24d5915e25d0e9a63b06d2ccf2ac5bc9
font_01_sfnt_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 9840 bytes
SHA-256: e48fc5ee9e60b0296a1629fcdbe062027f512b64afa627bf5476aa57d4c90af3

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