Malicious PDF — malware analysis report

Static analysis result for SHA-256 2322fa32821faf0f…

MALICIOUS

PDF

73.7 KB Created: 2020-04-07 14:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d2c3635a1dd8b6343a4d3704a918d1ef SHA-1: 4228da672761730d49341555f27aa43221b66088 SHA-256: 2322fa32821faf0f12aab9487a8aebafff03a013122cabb657c3c6cf2ed0ae48
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are numerically or generically named PDFs hosted on various domains. The document body itself contains a search query related to the Gestapo, suggesting a lure to draw users to these external sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm designed to manipulate search engine results.

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://bigdsuperfoods.com/uploads/1/3/0/6/130621328/130621328.html#que+es+la+gestapo+nazi
    • http://actamsea.org/uploads/1/3/1/3/131381491/5731094.pdf
    • http://satsanganata.com/uploads/1/3/0/4/130489771/zodisavesura-zisadutife-nugogim-buwito.pdf
    • http://holytrinityflowerybranch.com/uploads/1/3/0/7/130739688/6906955.pdf
    • http://dk44consulting.com/uploads/1/3/0/3/130323762/minol.pdf
    • http://sunshinerestaurant.ca/uploads/1/3/0/5/130545882/sasasewuse-foxadogadi-pifukun.pdf
    • http://mysolarpowerlasvegas.com/uploads/1/3/0/9/130969080/6260457.pdf
    • http://escmeribel.org/uploads/1/3/0/3/130324357/ddee7ba319fd3.pdf
    • http://dennisandkaterina.com/uploads/1/3/0/8/130814081/voluzopa-namegonupexixas-lebusibo-gopebiwogeb.pdf
    • http://blakejewelers.net/uploads/1/3/0/6/130605381/f0adf1a0917b1.pdf
    • http://legaldocumentpreparers.com/uploads/1/3/0/9/130969141/95fb24be7f2fe93.pdf
    • http://eppswelding.com/uploads/1/3/1/4/131407102/fobitapuseri.pdf
    • http://stacymosstechportfolio.com/uploads/1/3/1/4/131437162/rewetigolujuzat-zuliko-mugugumamumi.pdf
    • http://themeatballguy.com/uploads/1/3/1/1/131164129/2316698.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d305.bin
69312becf4ee895d2e039573e8306286b3e84d00b74e6178f5e362c712583cfa
pdf-font-stream PDF embedded font (sfnt) at offset 0xD305 11608 bytes
font_01_sfnt_off0000f8ce.bin
c8caf470709691a7e2c8423103b58a6f7b14666dda9c1d680bc7f1731a33b44f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 2764 bytes
font_02_sfnt_off0001029a.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 16036 bytes