Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a22576b97f27164…

MALICIOUS

PDF

49.3 KB Created: 2020-04-12 00:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ad72a1b76cb92a655b9c0e4ceec813eb SHA-1: 5785fe63ff7f13163ffaa130be6a0083f9a53b8f SHA-256: 0a22576b97f27164e5408e567f43a4023499b9e09c6051aead8abc6a7ded1626
136 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to various domains, a technique often used for SEO manipulation or to distribute malicious content. The heuristic PDF_SEO_LINK_FARM specifically identifies this behavior, indicating a high likelihood of malicious intent. While no scripts were directly extracted, the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://sunclubworldwide.com/uploads/1/3/1/1/131163538/131163538.html#ejercicios+de+integrales+por+cambio+de+variable+pdf
    • http://gtrenterprise.com/uploads/1/3/0/2/130272511/buvozamikesi.pdf
    • http://auxlogisdulac.com/uploads/1/3/0/5/130588712/29807fbfd117752.pdf
    • http://247housebuyer.com/uploads/1/3/0/7/130775986/3379624.pdf
    • http://agrseedandsupply.com/uploads/1/3/0/5/130589374/zuruzisofa.pdf
    • http://taxbizuniversity.com/uploads/1/3/1/3/131384602/7436ec10a4.pdf
    • http://elitepartnersllc.net/uploads/1/3/0/4/130483187/5034100.pdf
    • http://twinindie.com/uploads/1/3/0/7/130775753/tuludidoli.pdf
    • http://sally-glaze.com/uploads/1/3/0/7/130775751/toripajojute.pdf
    • http://tattoovictoriatexas.com/uploads/1/3/1/4/131453623/madexufeguriteb.pdf
    • http://muscarii.com/uploads/1/3/0/3/130313113/pemebaxidesi.pdf
    • http://constancebestwick.com/uploads/1/3/0/5/130540477/9751273.pdf
    • http://technidyneasia.com/uploads/1/3/1/4/131456320/5796512.pdf
    • http://starlightimagestudio.com/uploads/1/3/0/9/130969075/e71cf.pdf
    • http://encounterthespirit.com/uploads/1/3/0/6/130603971/5878052.pdf
    • http://restorativespaceyogaandmassage.org/uploads/1/3/1/3/131398083/6108b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000749a.bin
3d27b5346890832c52c26bed581fb63d6d40b065a2aeaa40de21c035310753d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x749A 9644 bytes
font_01_sfnt_off0000973a.bin
63f5e27ee3d24cc00d413e59c301cc73ab377383609796993547673f2bea898c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x973A 2600 bytes
font_02_sfnt_off0000a065.bin
cd0e6885033679dcada58a134048579453f868c4236891dee72f1f41d06d8f1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA065 16236 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.