Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd6381f564364ee…

MALICIOUS

PDF

38.5 KB Created: 2020-05-31 16:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7b6ab6a03d831fb083dc6651c4769e3 SHA-1: d5fa888acf5ec2589062fc521d3a43aa13c2378c SHA-256: 4fd6381f564364ee18250522bf1197f09ed5bbe093429576db8f8a3941b5b5a4
94 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links, and an embedded URL pointing to a page titled 'google offer letter'. This suggests a social engineering lure to trick the user into clicking the link. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the external URL which likely leads to a phishing or malware distribution site.

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://kristinchiu.com/uploads/1/3/0/9/130969910/130969910.html#google+offer+letter
    • https://jekokugin.files.wordpress.com/2020/05/lesituwisimotasilopabeb.pdf
    • https://tedinunimo.files.wordpress.com/2020/05/68300178715.pdf
    • https://buzaxobim.files.wordpress.com/2020/05/supomuranupabizowosisage.pdf
    • https://vabogojup.files.wordpress.com/2020/05/4442980860.pdf
    • https://murimesoxaj.files.wordpress.com/2020/05/wupomejopaxaguxap.pdf
    • https://wapoxijij.files.wordpress.com/2020/05/dedojebenokavel.pdf
    • https://fexujevimu.files.wordpress.com/2020/05/wajoxuf.pdf
    • https://duzawexosusa.files.wordpress.com/2020/05/xuwubunatefutowesovobav.pdf
    • https://sabuninovaju.files.wordpress.com/2020/05/34047888696.pdf
    • https://bababepuvo.files.wordpress.com/2020/05/mudifin.pdf
    • https://vijujodivefi.files.wordpress.com/2020/05/29008195487.pdf
    • https://jesudutidak.files.wordpress.com/2020/05/sifugotutijudosakore.pdf
    • https://fijapomabibo.files.wordpress.com/2020/05/xagezi.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/
    • https://vijujodivefi.files.wordpress.com/2020/05/290

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b5e.bin
2ccf7fbfebb4eac60fe1784a8f9fa4e8f06847c0ff986bd540150de8e6ad4ed7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5E 10380 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.