Malicious PDF — malware analysis report

Static analysis result for SHA-256 545badddda714f05…

MALICIOUS

PDF

37.5 KB Created: 2020-03-25 09:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dab45e25edc427ae994ac1d3d9a58eb0 SHA-1: c2ed28858876703eb9b1bf9e6a10a958529f42b7 SHA-256: 545badddda714f053a0d3c205fda9443baef8f8f6476a0c85ecc2088f36fe363
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a network of SEO-optimized PDF files hosted on these domains, likely as a lure for further malicious activity.

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://smilehearthk.com/uploads/1/3/0/3/130313366/130313366.html#mg+per+ml+to+mcg+per+ml
    • http://badcreditcarloanscanada.net/uploads/1/3/0/6/130604672/9811403.pdf
    • http://tryshashby-rolls.com/uploads/1/3/0/5/130550803/ronenijidilaxof-kufozibe.pdf
    • http://mariageronimo.com/uploads/1/3/0/5/130588980/foteso-filow-nuvez.pdf
    • http://yissilmissil.com/uploads/1/3/0/4/130476192/65b8d492.pdf
    • http://topoffus.com/uploads/1/3/0/7/130775796/7648882.pdf
    • http://p4partyproductions.com/uploads/1/3/0/5/130550928/b635022975ae.pdf
    • http://airyfitness.com/uploads/1/3/0/6/130639100/2277706.pdf
    • http://fiddlersgreenhome.com/uploads/1/3/0/3/130323513/5700873.pdf
    • http://www.carlospowellfoundation.org/uploads/1/3/0/4/130488544/wegaxusosopin_sagixo_lujate_fifalalak.pdf
    • http://phenomsafetyconsulting.net/uploads/1/3/0/6/130639744/mazivumovetafowil.pdf
    • http://reikoheartland.com/uploads/1/3/0/8/130874510/4347239.pdf
    • http://ovcarstvo.info/uploads/1/3/0/4/130491166/9295017.pdf
    • http://verticesglobals.com/uploads/1/3/0/5/130588320/bawojigeleb_fivamotowapa_navumaxa_patitivu.pdf
    • http://parkavenuespa.com/uploads/1/3/0/7/130740232/vovisogad-ravawom-vokujawe-nekopemed.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_off00006804.bin
d71e8fc215f74e8062d9b9f67a03c5ed2125114b29a413eaee809dffe8c93a71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6804 8332 bytes

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