Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f272fcfefcb26d…

MALICIOUS

PDF

40.3 KB Created: 2020-04-09 00:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ca190d1871b07cb25925db9cea59ad6a SHA-1: 0891a1dfb35edbdacfaf1868a574cc1fac7292a2 SHA-256: 77f272fcfefcb26d37ad08a1e75e013859fb16d54972ab2d579d74bf154024ef
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains a URL that is also present in the list of extracted URLs. This suggests a coordinated effort to redirect users to potentially malicious or SEO-abused content.

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://fulanisbeautybar.com/uploads/1/3/0/4/130476732/130476732.html#verbos+transitivos+ejemplos
    • http://gothic-flicks.com/uploads/1/3/0/2/130288551/b26cbf21f0b7ebe.pdf
    • http://deliverhrllc.com/uploads/1/3/0/4/130476130/vodefenukiviwa.pdf
    • http://lacontagroup.com/uploads/1/3/0/3/130313213/4460009.pdf
    • http://dreamdestinationtravels.net/uploads/1/3/0/6/130621033/26f2c7046da.pdf
    • http://intradosconstruction.com/uploads/1/3/1/3/131398444/jejufoduwamofem.pdf
    • http://iappsmusic.com/uploads/1/3/1/4/131409709/wiwagapuzaveneponu.pdf
    • http://chiefleadsofficer.com/uploads/1/3/0/5/130541733/nasonog.pdf
    • http://itsasnuggles.com/uploads/1/3/0/6/130622022/piluvipabubu-napomenepari.pdf
    • http://smart-k9.com/uploads/1/3/0/2/130287878/pudorapemamafo_kubodagunofaw_sojodeniza.pdf
    • http://lindseymichalowski.com/uploads/1/3/0/4/130476740/8af40b.pdf
    • http://kiyonaga-gym.work/uploads/1/3/0/2/130289441/72777c75f5.pdf
    • http://sellsugarhouse.com/uploads/1/3/0/4/130488847/lumejevi-rovosupuze.pdf
    • http://coachingcatalyst.net/uploads/1/3/1/1/131163859/4340172.pdf
    • http://hutterhouse.org/uploads/1/3/0/2/130289732/3981649.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_off000072c5.bin
07e0e7a630b54438609af94913708f8479ebabeb45e079e0302f3c31d0a421ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C5 8816 bytes

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