Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b8e3fd1c2dffd4…

MALICIOUS

PDF

58.8 KB Created: 2020-04-04 09:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f3088d02d14b2c5642d75440ee0d52f9 SHA-1: 4b761c1c0adb130addb904ef96867273fbe578ff SHA-256: 48b8e3fd1c2dffd4d5d4f2109b22237ac936889a8ca3f184ac8881a620435fdb
94 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, many of which point to other PDF files with numeric slugs, indicating a link farm or SEO abuse tactic. The document body, though partially corrupted, contains text related to electrical power formulas and references the wkhtmltopdf tool, suggesting a deceptive lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous embedded URLs supports a malicious intent, likely to drive traffic to malicious sites or host further malicious 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://kenhtienso.net/uploads/1/3/0/2/130289530/130289530.html#formulas+para+calcular+potencia+activa+reactiva+y+aparente
    • http://powerconcious.com/uploads/1/3/0/8/130814341/3555178.pdf
    • http://placeofthefuture.co/uploads/1/3/1/3/131380885/zabotulerirerazuvos.pdf
    • http://gloriousgardens.net/uploads/1/3/0/4/130435725/fukurilo-fexolesafunug-tukupora-bewejenofozakix.pdf
    • http://ashleywebernd.com/uploads/1/3/1/0/131071184/7906a4ae48.pdf
    • http://thequickenloanspartnership.com/uploads/1/3/0/8/130814178/5607867.pdf
    • http://smoknmeatsandbbq.com/uploads/1/3/0/2/130274376/fimofasodilix_mefaso_sesonafoviposa_tilitotepox.pdf
    • http://gdgoenkamun.com/uploads/1/3/0/4/130479008/3f785f.pdf
    • http://edtechjunkie.com/uploads/1/3/0/5/130551991/zesadabut.pdf
    • http://mal-test.com/uploads/1/3/1/0/131070146/bejokomawe.pdf
    • http://pokeplayerhq.com/uploads/1/3/0/5/130588769/6504687.pdf
    • http://thehandymanservice.org/uploads/1/3/0/6/130603985/0cacdf44f1a9f.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_off00009785.bin
cd050e6e562c5c72fd6edfdad8bfe6217b217cfb90adffc87d646cb45a66f4c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9785 9400 bytes
font_01_sfnt_off0000b9d4.bin
83a2c746099568d75cfa54e2bb454999a111f5f830f0a078b07526cc6510b009
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D4 3304 bytes
font_02_sfnt_off0000c564.bin
4679165d343df55ddb82ee031293f7dcd8e6238be598fb97e9e74909e3fbbded
pdf-font-stream PDF embedded font (sfnt) at offset 0xC564 16288 bytes