Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a44bb9b3b297fa…

MALICIOUS

PDF

40.3 KB Created: 2020-03-22 02:38:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ed4b45cd8395a4c369ef9f94f65824f4 SHA-1: 07a7591131f826d0329c51db4beddfb0f4ba0a36 SHA-256: 49a44bb9b3b297fafea8d5016fc8475ba41c5067f440abb9d795cdd8b5860054
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious content. The document body, though partially corrupted, contains text related to a 'D'link switch dgs-1005d manual', suggesting a lure to trick users into clicking the embedded links. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm attack pattern.

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://scottmemorialcog.com/uploads/1/3/0/2/130270990/130270990.html#d%27link+switch+dgs-1005d+manual
    • http://www.mansakonko.nl/uploads/1/3/0/6/130639249/7a0382d8af8.pdf
    • http://celticcollective.com/uploads/1/3/0/6/130622058/43419.pdf
    • http://andrewgouldmusic.com/uploads/1/3/0/4/130476493/a375e07e.pdf
    • http://jamisonretirement.com/uploads/1/3/0/3/130313054/wugefedujetil.pdf
    • http://thestandguild.com/uploads/1/3/0/4/130488914/6874743.pdf
    • http://webdisk.howtoliveforever.com.au/uploads/1/3/0/4/130476513/leforotorugidudi.pdf
    • http://carolynwiese.com/uploads/1/3/0/4/130491271/silaxezopem-wunafitorulilur-sogebanozofijev.pdf
    • http://leadsforlocals.net/uploads/1/3/0/2/130289676/lodazadevinafup_kosatago.pdf
    • http://kissimmeehomesforsale.net/uploads/1/3/0/7/130776503/3570294.pdf
    • http://theprotocolandetiquetteschool.com/uploads/1/3/0/4/130477755/b42b88.pdf
    • http://chloecustomcollections.com/uploads/1/3/0/6/130621083/zesuxusilinana.pdf
    • http://cobblestonecottageteashoppe.com/uploads/1/3/0/4/130478831/wugasefaje.pdf
    • http://kathiegreenmedia.com/uploads/1/3/0/2/130291649/da1d0.pdf
    • http://www.maternalbirths.com/uploads/1/3/1/0/131070786/6219236.pdf
    • http://salonesycentros.com/uploads/1/3/0/5/130551142/kokezewesef.pdf
    • http://www.collegebudgethealthy.com/uploads/1/3/0/7/130776148/215720.pdf
    • http://healthypins365.club/uploads/1/3/0/2/130270796/90d1c89d4d.pdf
    • http://wit-isms.com/uploads/1/3/0/3/130323511/2921074.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_off000074c6.bin
87e9df6aa75eba815ad1ae061297c1cf8a75f988d824faa86b3f94a7da4b02e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x74C6 8052 bytes