Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc38e1b227d6bdf…

MALICIOUS

PDF

38.7 KB Created: 2020-04-13 05:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 469ad29897609bd332653919049722c8 SHA-1: c4ac802a7cfaa64dc1c4f75cc55f86e0a76d48c0 SHA-256: 6cc38e1b227d6bdfefea70388c068168c26160d08ea8d2e13ef32379367be0ef
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which are structured as a link farm, suggesting a malicious intent to redirect users to potentially harmful content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this assessment. No scripts were extracted from this sample.

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://sunrisemarketanddeli.com/uploads/1/3/0/5/130550697/130550697.html#neumonia+por+aspiracion+pediatria+sintomas
    • http://imprimerieabasprix.com/uploads/1/3/1/4/131453484/kaziviganuzaf.pdf
    • http://ocsioptiumcybersystemsinc.com/uploads/1/3/0/7/130775630/d4a1044c7779.pdf
    • http://petitehabitats.com/uploads/1/3/0/4/130435763/medogusubuxuvaf.pdf
    • http://marksauter.com/uploads/1/3/0/8/130814050/3371523.pdf
    • http://spokentruthspodcast.com/uploads/1/3/0/8/130813601/wenagovep-zexukozun.pdf
    • http://onetest-community.com/uploads/1/3/0/9/130969371/1530231.pdf
    • http://phdimensions.com/uploads/1/3/0/3/130379475/22527ba.pdf
    • http://davisandcodesign.com/uploads/1/3/0/4/130483629/d1b3927e3290.pdf
    • http://skynet247.com/uploads/1/3/0/6/130604885/toguji-wotebokokaguw-rizudofuretibav.pdf
    • http://bonniesportfolio.com/uploads/1/3/0/7/130775029/3781ed6e5e840.pdf
    • http://theladderprojectandco.com/uploads/1/3/1/3/131383482/2572338.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_off00006dbd.bin
84714bb5f82bb8bdffc32c45f2690b275807d1a8dcdb3efc0ab5584bd4a55bbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DBD 8604 bytes

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