Malicious PDF — malware analysis report

Static analysis result for SHA-256 89950ebfc9677b80…

MALICIOUS

PDF

47.2 KB Created: 2020-04-15 03:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e21160925252580f0ba8c4218bcae1c8 SHA-1: 4b2869a3ac464a1b6b92fb0d7819196226e1e45f SHA-256: 89950ebfc9677b80144968751742b08034a3b52a776cd8d0ed18f610ba66e8ca
72 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files with numeric slugs, indicating a link farm. The document body, though heavily obfuscated, contains a reference to 'Clinician's thesaurus pdf free' and a call-to-action phrase, suggesting a lure to download or view content. The primary malicious activity appears to be directing users to a network of suspicious URLs.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://mdprtnrs.com/uploads/1/3/1/6/131606109/131606109.html#clinician%27+s+thesaurus+pdf+free
    • http://jf1850.com/uploads/1/3/0/2/130274371/4e2aa5913.pdf
    • http://perreofit.com/uploads/1/3/0/6/130639546/7024916.pdf
    • http://daviecollegerentals.com/uploads/1/3/0/4/130435574/89fd41e5.pdf
    • http://justdonateonline.com/uploads/1/3/0/2/130270874/nixusudawotil_motumoposuwuzum_zabap.pdf
    • http://notforsakenministryinc.org/uploads/1/3/0/8/130873877/4710323.pdf
    • http://monocleroastingco.com/uploads/1/3/0/6/130621998/timumidegi.pdf
    • http://kingmaker-dales.com/uploads/1/3/0/8/130874077/ximikibo-pelupanij.pdf
    • http://rateyourinterviews.com/uploads/1/3/0/2/130289557/xupikavona.pdf
    • http://dallasrvbuyers.com/uploads/1/3/1/3/131379033/redegodewadikuw_dorumupadatimub.pdf
    • http://newvisionedsolutions.com/uploads/1/3/1/4/131454593/0c26ffbc.pdf
    • http://laurenpeterpauldesign.com/uploads/1/3/0/6/130605089/ruvegi.pdf
    • http://conjecturebooks.net/uploads/1/3/1/4/131454238/sifibojumaso_podogazewigux_pupusuf_fexagidaru.pdf
    • http://youriepteam.com/uploads/1/3/0/5/130544878/diwulunowori.pdf
    • http://justdonateonline.com/uploads/1/3/0/2/130270874/nixusudawotil_motumopos
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000841c.bin
507c17231abda3007f5a56029e6a77de5e41b44f520ade96d1b29cc298802d4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x841C 9884 bytes
font_01_sfnt_off0000a6f7.bin
dab1075ebef377275e2b45e9a301788cea1b35929fa014a3be1cbc1c3b87477d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6F7 1916 bytes

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