Malicious PDF — malware analysis report

Static analysis result for SHA-256 43eecb0560862f39…

MALICIOUS

PDF

35.9 KB Created: 2020-04-15 07:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 30ec4441353f8af2708d32186f8da152 SHA-1: 3dd089033157d77592fe56ec433bbb117ab4e607 SHA-256: 43eecb0560862f3914a39e096ab4e44705bbd4b72d865374e74ed518ffbcab02
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, contains URLs that are part of this link farm. This suggests a tactic to manipulate search engine results or distribute malicious content through a network of linked PDFs.

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://paskiclub.com/uploads/1/3/1/3/131383936/131383936.html#urodynamics+made+easy+4th+edition+pdf
    • http://o2sales.fun/uploads/1/3/0/5/130547624/675982.pdf
    • http://languagelosangeles.com/uploads/1/3/0/3/130313155/28d312680ff536.pdf
    • http://pacific-travel.net/uploads/1/3/1/4/131453106/digofetuninufawaxa.pdf
    • http://johnhancockcenterchicago.com/uploads/1/3/0/3/130379894/cc2aae.pdf
    • http://electrotech.vip/uploads/1/3/1/3/131381555/joxasegaxiraf_ginamitafip_gojokizel_bivofuraweteg.pdf
    • http://jcdavisenterprises.com/uploads/1/3/0/3/130323523/zalizogokekebe.pdf
    • http://secondhandsecrets.com/uploads/1/3/1/3/131379590/4938196.pdf
    • http://betterwellnesskc.com/uploads/1/3/0/7/130739250/fibusule-pekadatadaxi.pdf
    • http://asuwaterpolo.com/uploads/1/3/0/3/130323936/5e120.pdf
    • http://ktecobox.com/uploads/1/3/0/2/130287971/fabovuvutak.pdf
    • http://garagedoorwallpaper.com/uploads/1/3/0/9/130969798/1809516.pdf
    • http://ideal-ideal.com/uploads/1/3/0/5/130589312/tukukefurotibiw.pdf
    • http://matennispassion.com/uploads/1/3/1/3/131398489/sapozedatimufa_dotexelofas.pdf
    • http://streamlinedcleaningservices.net/uploads/1/3/0/7/130739705/bumag.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065ac.bin
ebde36f54643427849735920ca0ae05e04a4e66ec263ab2ffbdda927727edfa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65AC 7616 bytes

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