Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f8de4b72caa2ef…

MALICIOUS

PDF

63.6 KB Created: 2020-12-31 03:39:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 279a029034597ceedd7d923579aa53eb SHA-1: 7c835b2bb7c8bc482a01a8a0b857ddf3799a55e5 SHA-256: 71f8de4b72caa2ef119edf7b80a41b6c72b105d3eeeb1452e84311168e6ceddb
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. The document body, though heavily obfuscated, contains a question that could be used as a lure to click on the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/123?utm_term=does+discord+send+read+receipts In PDF document text
    • https://cdn-cms.f-static.net/uploads/4486563/normal_5fe7fe1258705.pdfIn PDF document text
    • https://webuwoterin.weebly.com/uploads/1/3/4/5/134589655/xikonaj-dodapadajopo.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/satudifin/22435476899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf15558-ff35-4fb7-a51e-6a5e6aa2cb75/64318924232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07d51254-fedc-40b8-9870-54add3ca7917/63872832109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59747d91-bda3-4cd9-9c89-0e25d5b97bbe/practical_egyptian_magic_murry_hope.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/47494694182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff895427-b9b8-4854-b0af-b4e96133b1c7/jezalovumerutexegirevaxed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b49fac40-7a38-4e2b-bf79-7efc65d1e580/xedefakekix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16da8de5-4b54-4398-bcec-19f0caa9eca9/lejufebupeneder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6163ffff-b1fd-4b96-a657-81cfc22ea3f7/25004675754.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_off0000be81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE81 5036 bytes
SHA-256: bfa3671112d6d94d11a0a3bb4ff2cd53bacf01de738ffa37dcd754f1f7f75b00
font_01_sfnt_off0000cfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB4 10144 bytes
SHA-256: e0c09d6500fc3f189e42c8e12c439be8cc08f174df430fad6979cd6bb71564b4

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