Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f9dd6e44d15103…

MALICIOUS

PDF

82.3 KB Created: 2020-06-08 05:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 789f29bb9dde24c092914d1ca00d73cc SHA-1: 06f279d3e2465c5cf74ca4daece10cbf3c993ce3 SHA-256: 37f9dd6e44d15103543babb77a135f8c4a69c5da14fd8e567fc1f30d3b2cc9d5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, many of which are dynamically generated and likely serve as a link farm to obscure the final malicious destination. The primary URL found in the document body, http://74-123-77-179.mgwnet.com/uploads/1/3/1/3/131384503/131384503.html#%25D8%25B4%25D8%25B1%25D9%2583%25D8%25A9+%25D8%25A7%25D9%2584%25D8%25B7%25D9%258A%25D8%25B1%25D8%25A7%25D9%2586+%25D9%2584%25D8%25B5%25D9%2586%25D8%25A7%25D8%25B9%25D8%25A9+%25D8%25A7%25D9%2584%25D8%25A3%25D8%25BA%25D8%25B0%25D9%258A%25D8%25A9, is also part of this pattern. This suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 4

  • 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.
  • 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://74-123-77-179.mgwnet.com/uploads/1/3/1/3/131384503/131384503.html#%25D8%25B4%25D8%25B1%25D9%2583%25D8%25A9+%25D8%25A7%25D9%2584%25D8%25B7%25D9%258A%25D8%25B1%25D8%25A7%25D9%2586+%25D9%2584%25D8%25B5%25D9%2586%25D8%25A7%25D8%25B9%25D8%25A9+%25D8%25A7%25D9%2584%25D8%25A3%25D8%25BA%25D8%25B0%25D9%258A%25D8%25A9 PDF link annotation
    • http://blacklines.org/uploads/1/3/0/7/130739444/watugamas.pdfIn PDF document text
    • http://caramichellevideography.com/uploads/1/3/0/5/130588550/9172242.pdfIn PDF document text
    • http://drthatch.online/uploads/1/3/0/6/130639484/2386639.pdfIn PDF document text
    • http://hostmaster.chartreuxcat.net/uploads/1/3/0/5/130543272/rawofimo.pdfIn PDF document text
    • http://reformo.studio/uploads/1/3/1/4/131437025/buvesululag.pdfIn PDF document text
    • http://bees-boss.org/uploads/1/3/0/2/130273798/nosotu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ketikukowef.files.wordpress.com/2020/06/20099470936.pdfIn PDF document text
    • https://piboberedaz.files.wordpress.com/2020/06/4705211861.pdfIn PDF document text
    • https://gavebekakak.files.wordpress.com/2020/06/44773966859.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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 2

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
stream_002_off0000e27d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE27D 32972 bytes
SHA-256: 69217cea942b973ec738be9ebd0871a4aadc97496d97ed553ac755615980385e
font_01_sfnt_off00011b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B31 9348 bytes
SHA-256: 167c18991ed7bcad470d4d47c5a9e2c30946083720bb9908633fceef237d1031

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