Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad8a222bdd6750f…

MALICIOUS

PDF

51.2 KB Created: 2020-04-13 13:38:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2341e55e6fc2a83d46f6bd679945c703 SHA-1: 3eaa308e08740832c5aa2b27a2069ad648fee832 SHA-256: 1ad8a222bdd6750fd0ce165fd5c0e74d8fd12cb2efaf2bacc31eafaa17adf9ef
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, many of which point to domains that appear to be part of a link farm. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests this is an SEO spam or phishing attempt. The document body, though partially corrupted, contains text related to 'Recursos educativos para religion primaria', likely a lure to disguise the malicious intent. No scripts were extracted, but the extensive use of external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://kelbels.org/uploads/1/3/0/6/130605146/130605146.html#recursos+educativos+para+religion+primaria
    • http://frankebillingsley.com/uploads/1/3/0/4/130476372/maleza_mesigexutu_jeposotali_xezuxeg.pdf
    • http://micahandersonmfti.com/uploads/1/3/1/3/131383342/00c48e9b8df.pdf
    • http://theoriginalmrfixit.com/uploads/1/3/0/8/130814115/3007066.pdf
    • http://kangwie.com/uploads/1/3/0/7/130739828/8091498.pdf
    • http://lcbois64.fr/uploads/1/3/0/2/130289363/buzavepurej.pdf
    • http://diegojmurphy.com/uploads/1/3/1/3/131383764/sabonog.pdf
    • http://lesgarrett.com/uploads/1/3/0/4/130488063/4d96f5005971003.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_off000089e0.bin
47c300bd1ede47a95505ca2455eaf131857ca7f74c17679e4ec9dd89793f69f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89E0 8888 bytes
font_01_sfnt_off0000aa67.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA67 16036 bytes

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