Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52b78a4a2264271…

MALICIOUS

PDF

35.7 KB Created: 2020-06-22 13:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0d2e179dbe429d1b939aa9823944ee4 SHA-1: 0a1f10361640d5a2ff366460b12fb1178fcb5834 SHA-256: a52b78a4a226427126bae9030bbca241d93e8b5c7a6ceed135f6723412d03ad3
94 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are structured as SEO-optimized PDF links pointing to various domains. The document body mentions 'online dwg to pdf conversion', suggesting a lure to trick users into clicking these links. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ncahe.com/uploads/1/3/1/4/131410597/131410597.html#online+dwg+to+pdf+conversion
    • http://grheatingandcooling.net/uploads/1/3/1/6/131606275/jogaxul.pdf
    • http://archi-graphics.com/uploads/1/3/0/4/130490461/texudoluja_wulibaxuj.pdf
    • http://mx.shajaceramics.com/uploads/1/3/0/9/130969614/xaxenusopu.pdf
    • http://sophistable.com/uploads/1/3/1/3/131383646/lifozasaj.pdf
    • http://eastwestmassageandyoga.com/uploads/1/3/0/2/130272278/lixavofen_mofelaxo.pdf
    • http://howdysugah.com/uploads/1/3/0/4/130483428/0669afbdf6e2132.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004989.bin
979d2565ff6ca1a1411f08ec4f1897eb0b5782b338dba065ea3fead0886225d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4989 5080 bytes
font_01_sfnt_off00005b0a.bin
73528842beff473108ff23d26a732f7297aa8029c31ed4bb105090142b0fa408		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B0A 14652 bytes

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