Malicious PDF — malware analysis report

Static analysis result for SHA-256 5071456e6b23e711…

MALICIOUS

PDF

38.7 KB Created: 2020-04-05 10:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 361ad38ba4bac7087f76ea3988bd3dc9 SHA-1: edcff5b8ee60ac309a468c00482787939f8bb6ed SHA-256: 5071456e6b23e711d866a3bd2812a1c1c5ee44a4042ab24d4971f2d23710a4de
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files on unrelated domains, indicating a link farm or SEO spam tactic. The document body, though partially corrupted, suggests a unit conversion theme ('Equivalencia yardas y metros') which is likely a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://jhrpropertyltd.com/uploads/1/3/0/7/130775403/130775403.html#equivalencia+yardas+y+metros
    • http://unitedfirstusa.com/uploads/1/3/0/8/130873849/c9150ce884.pdf
    • http://signalsolutionstx.com/uploads/1/3/0/6/130604370/libilelowedoge.pdf
    • http://subtunes.nyc/uploads/1/3/1/1/131164270/3535738.pdf
    • http://oaktreecapllc.com/uploads/1/3/0/9/130969616/mebutadokuka.pdf
    • http://sevendozen.com/uploads/1/3/1/0/131071308/e2b4b0.pdf
    • http://thedrakebareugene.com/uploads/1/3/0/7/130738979/xesofon.pdf
    • http://anglicanparishofwoodstock.ca/uploads/1/3/1/3/131384418/c5a67755.pdf
    • http://livegenics.com/uploads/1/3/0/5/130590588/8b71764b85b.pdf
    • http://directorsofficersliabilityinsurance.wales/uploads/1/3/0/8/130874299/2742bc.pdf
    • http://firtreeservices.com/uploads/1/3/0/6/130640092/8592757.pdf
    • http://polymathlearningcentre.com/uploads/1/3/1/4/131437299/lilezedisofeko_buxaniwa_raliduwegurebu_luwawivebirutuv.pdf
    • http://my-jungle.com/uploads/1/3/0/6/130639227/b53d22.pdf
    • http://northeconstruction.com/uploads/1/3/1/0/131070447/386766.pdf
    • http://fpeletrica.com/uploads/1/3/0/7/130776741/d7d49.pdf
    • http://lobsterfestsaba.com/uploads/1/3/0/4/130494871/vawun.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007177.bin
95169057ecfc8110c429cc2df2df14cea1b7215850c86559dc3f5033764ff63c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7177 7604 bytes

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