Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf1b448af1de371…

MALICIOUS

PDF

73.6 KB Created: 2020-12-22 21:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 40e4d653f432b078db45740870b29195 SHA-1: 94181242f08f97931bbfe5c32e8851d254673f4c SHA-256: baf1b448af1de3717624155364839b6261cc9d4da2d70259cc9cf93ab8ec01a1
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by multiple critical heuristics as malicious, including a link to known malicious redirector infrastructure and a lure for clipboard command execution. The ML classifier also strongly indicated maliciousness. The presence of a link farm suggests an attempt to distribute malicious content or SEO manipulation. The clipboard lure indicates an intent to trick the user into executing commands, likely to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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/strik?utm_term=microsoft+365+admin+center+forward+email In PDF document text
    • https://ralugegab.weebly.com/uploads/1/3/4/8/134888835/6171103.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/vebenok/fodifediwufuk.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/kivavotiliragepuxetixawut.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fe012d01c1e0e411325845a/t/5fe0bd973fd0f240be9e6840/1608564119510/cursive_worksheet_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/51471708525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d98222b-5786-4f62-afd3-b48935924529/85342849820.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc14f07b8467722f1d70f1c/t/5fcc122b05ddc9599d0ede28/1607209515309/cap_senior_flight_release_officer.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/xetuxepejajudebegetefefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/635d00d6-f3dc-49a9-b41d-548aeebe14e2/12599103125.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/25485418270.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/rujefutu.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/van_de_graaff_generator_build.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 5708 bytes
SHA-256: a9a9e16ea0c406c71e870344c1d5969c428a4b45432ba4900b9466b17bf516f1
font_01_sfnt_off0000ea34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 2236 bytes
SHA-256: 0e0d8dd5fa691c094b48e8b5f0ccdd47a9bdd2c5f4b230a5db6e59b1d82e6bca
font_02_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 10680 bytes
SHA-256: 9c938a239786c9a25aeb956fdd0d320033f5cb1d3311f987c80e3edfcd6dbdb1

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