Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb025e489c12e7e…

MALICIOUS

PDF

37.8 KB Created: 2020-06-21 13:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 006bcdaf7f35defbb52dc79055aff1a4 SHA-1: e9b12f38d64e654112c6874a2693929f16d01c81 SHA-256: 1cb025e489c12e7e4e71e75e9c1c0bbaab26ab53e9092652be03a1416feb5051
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO poisoning or phishing campaigns. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains references to these links, reinforcing the attack pattern. No scripts were extracted, limiting the analysis of specific payload delivery mechanisms.

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://sundogstills.com/uploads/1/3/0/2/130274316/130274316.html#bluetooth+low+energy+tutorial+pdf PDF link annotation
    • http://renewalleave.com/uploads/1/3/0/6/130621022/f1b4c33ed5.pdfIn PDF document text
    • http://prospectplumbingandgas.com/uploads/1/3/0/6/130640144/magoleda_gogivipiv_zevetajilixi.pdfIn PDF document text
    • http://sitemove556.com/uploads/1/3/1/3/131379586/jubutovelikaxomalej.pdfIn PDF document text
    • http://mail.sebolt.com/uploads/1/3/0/2/130288394/3555908.pdfIn PDF document text
    • http://michelleprebilic.com/uploads/1/3/0/5/130589077/zukukotog.pdfIn PDF document text
    • http://mail.vaporhauschicago.com/uploads/1/3/0/6/130603741/8758703.pdfIn PDF document text
    • http://graduationtoretirement.com/uploads/1/3/1/8/131871744/5932325.pdfIn PDF document text
    • http://michaelkitzes.com/uploads/1/3/1/4/131410736/246c42a486787.pdfIn PDF document text
    • http://autodiscover.thesinglespoon.com/uploads/1/3/1/8/131856945/11c1afea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5695 5248 bytes
SHA-256: 4a4a8cc115893d80d46906718544f8889f50499439b328d161bba4ae949f69ab
font_01_sfnt_off00006880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6880 10108 bytes
SHA-256: c07b2ee479eed43a058d632de1fa18900484ecbaff3e7fa740540efdfc00b22f