Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe2ecfda1a82b11…

MALICIOUS

PDF

40.2 KB Created: 2020-03-21 18:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 278bb55c02666bc022f2b86ef57fb9b8 SHA-1: 63145c5173d29577f7c686b7d145c2cc2c600f15 SHA-256: cfe2ecfda1a82b116becb78bf8fa45846b7a7858ec73d73227d13ed4069f11a0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO spam operation. The document body mentions 'Acorn 180 curved stairlift fault codes', which appears to be a lure to attract clicks to these external URLs. No scripts were extracted, and the primary malicious activity observed is the distribution of numerous links to potentially malicious or unwanted content.

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://marythumma.com/uploads/1/3/0/4/130483238/130483238.html#acorn+180+curved+stairlift+fault+codes
    • http://leegiles.net/uploads/1/3/0/9/130969206/pedolonojurozile.pdf
    • http://mid-statesasphalt.com/uploads/1/3/0/2/130272928/e8de4f2f.pdf
    • http://steffenflooring.com/uploads/1/3/0/4/130488229/1340414.pdf
    • http://johngriffithdesign.com/uploads/1/3/0/2/130289290/xafofud.pdf
    • http://digital-human.org/uploads/1/3/0/5/130540214/xujow_jepujadabujepi_fiwimekavobipiz.pdf
    • http://precisionskitune.com/uploads/1/3/0/2/130288644/wuzujepesig.pdf
    • http://galenetics.org/uploads/1/3/0/6/130620172/58946.pdf
    • http://romeda.net/uploads/1/3/0/7/130739256/wufanur_funom_xejudolula.pdf
    • http://www.janineibbotson.org/uploads/1/3/0/5/130590654/2110974.pdf
    • http://whorganised.com/uploads/1/3/0/4/130488993/tibofuwasivesiko.pdf
    • http://pamlicotreecare.net/uploads/1/3/0/7/130776122/vexobe_lokagomotik_xuninapugisijo_zujanilewosok.pdf
    • http://www.realestatepictures.de/uploads/1/3/0/4/130435667/7801715.pdf
    • http://preschoolmusicclasses.net/uploads/1/3/0/7/130738715/tirixofapiruf-fizagiviwe.pdf
    • http://en.whaaatstudio.com/uploads/1/3/0/3/130312923/kuwemijakelukev.pdf
    • http://viequesrentalwithviews.com/uploads/1/3/0/2/130272552/c8cd7c63ad94df.pdf
    • http://sweetsmilebrigaderiagourmet.net/uploads/1/3/0/6/130620563/0f5f234f8.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_off000075a4.bin
ad9ee6c05ed12c5883064038b1fde8776e6e3a0efece816fffdca990e1a8a97a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A4 7668 bytes

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