Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b86aa5b6f3acf3…

MALICIOUS

PDF

45.4 KB Created: 2020-04-17 06:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: e76cfa8745faa037ac89ef9139a745e7 SHA-1: 4bcc3bd2e3b95956b465b23b8ba8ed76e48b29e4 SHA-256: f1b86aa5b6f3acf3729282db3ab4e977f7ec04fb503115b18f225b387cc2f746
152 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with many links pointing to PDFs hosted on similar domains. The document also instructs the user to disable security software, a common tactic to bypass defenses. The presence of a download button lure further supports a malicious intent to trick the user into downloading a payload. No scripts were extracted, limiting the ability to determine the exact payload or delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://anne-klein-personaltraining.com/uploads/1/3/1/4/131406698/131406698.html#clumsy+ninja+hack+android+1 PDF link annotation
    • http://mylibraryrocks.com/uploads/1/3/0/2/130288932/4d12652c.pdfIn PDF document text
    • http://oranoandcapgemini.com/uploads/1/3/0/7/130740218/8987020.pdfIn PDF document text
    • http://onehealthepigenomics.com/uploads/1/3/0/7/130776106/262274960e66c.pdfIn PDF document text
    • http://magubymaguquintana.com/uploads/1/3/1/4/131453713/zeburoleda.pdfIn PDF document text
    • http://lestateliving.com/uploads/1/3/1/3/131398509/jatera-kuvumi.pdfIn PDF document text
    • http://wileyhealth10.com/uploads/1/3/0/2/130272973/sijuvizijigamulexeb.pdfIn PDF document text
    • http://adamkirk.net/uploads/1/3/0/4/130477252/59105b9799.pdfIn PDF document text
    • http://malichimusic.net/uploads/1/3/1/3/131381985/332538cf9e55b4.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B2 8076 bytes
SHA-256: 503f74fa319485337fc1962c0e88a6a525de0e25887a72a93cb02f1b31955042
font_01_sfnt_off000092dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92DC 16096 bytes
SHA-256: bb65e153df78154bfd14470754e87ba03df7715f8d52849d071c5334056f3476

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