Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd7d69d16afe735…

MALICIOUS

PDF

41.7 KB Created: 2020-03-30 19:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cee3ca8fc517ce59d0b0709957ab52ac SHA-1: f0fc2c2e5c2c1f385aff40d449c1ac8e07fb432b SHA-256: 5fd7d69d16afe735042b3cf3de4fb20f563bcdbc3703ae44d29fc79b5bc9d68c
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains a URL that points to a similarly structured link. This suggests the primary purpose is to redirect users to a network of linked content, potentially for SEO manipulation or to serve as a distribution point for further malicious payloads. 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://adventureinstincts.com/uploads/1/3/0/6/130604402/130604402.html#fotos+de+2019+feliz+a%C3%B1o
    • http://larson-homes.com/uploads/1/3/0/7/130739446/kejolukejo-pafezoriw.pdf
    • http://eco-quest.org/uploads/1/3/0/4/130477945/2884880.pdf
    • http://firebrandsociety.com/uploads/1/3/0/6/130604907/wasatemuvusenim.pdf
    • http://pokenfil.com/uploads/1/3/0/2/130288893/vozunum_nukamadesil_makodomu_gosodul.pdf
    • http://cassidy.website/uploads/1/3/0/3/130323455/korowedib_zenanitutow_zonosevorike.pdf
    • http://maggiealex2019.com/uploads/1/3/0/9/130969469/riwalikibereva_doxaziwoforeka_sijugikejulo_tirorakaf.pdf
    • http://madronafamilyfarm.com/uploads/1/3/0/8/130814923/545e3c3520.pdf
    • http://flostatebrass.com/uploads/1/3/0/4/130488401/gibosiguka.pdf
    • http://mta-sts.oleanfoodpantry.org/uploads/1/3/1/0/131070692/5092721.pdf
    • http://alejandramur.com/uploads/1/3/1/3/131384254/babati-jebivojes-rejusigetobax-jaxotudisu.pdf
    • http://airwavetest.com/uploads/1/3/1/1/131163898/4fc018.pdf
    • http://dileservices.com/uploads/1/3/0/5/130589334/xuporefizerez.pdf
    • http://xaviersims.com/uploads/1/3/0/3/130313247/gexivobezopov.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/
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000689c.bin
f709560b37355f3ad3f89aae5b596354634e6efc53d444e32b39aef8897f66e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x689C 8848 bytes
font_01_sfnt_off000087bb.bin
51c250877bd9ac1ddc6a0bf65f794fce8f3d5bce4d2fb2de6480af4020da78dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x87BB 4972 bytes