Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5f05e05b40d630…

MALICIOUS

PDF

40.1 KB Created: 2020-03-29 07:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fbc3a0e260dde5efaae40fd49174d48d SHA-1: 18e938b3825f9f5ae2fec7b2703e691c89dc73e8 SHA-256: 2f5f05e05b40d630be88562f3c860c29e087c392f7b07a8c3d901f47a0d0d12a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of outbound links suggests an attempt to direct users to potentially malicious or unwanted content. The document body contains garbled text and what appears to be a reference to a Whirlpool washer error code, possibly a lure.

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://gclub.lucky1st.com/uploads/1/3/0/7/130739835/130739835.html#whirlpool+washer+says+f9+e1
    • http://sontimes.org/uploads/1/3/0/7/130738566/lonomigozabuxuto.pdf
    • http://mysweettopia.info/uploads/1/3/0/7/130739781/xepozexor.pdf
    • http://littlecuriositycorner.com/uploads/1/3/0/7/130739732/winusibu.pdf
    • http://lawnandorder.mobi/uploads/1/3/0/2/130288483/23ac28582de4e.pdf
    • http://nickysawesomewebsite.com/uploads/1/3/0/7/130739978/0719df9d3a70f61.pdf
    • http://ns2.domtel.com/uploads/1/3/0/5/130539048/lejawufikofiwun.pdf
    • http://www.ludwigcluyseart.com/uploads/1/3/0/5/130539354/budilaluvafugazu.pdf
    • http://smanderer.com/uploads/1/3/0/5/130588864/ba24de4214c740.pdf
    • http://betterwiththebible.com/uploads/1/3/0/5/130541077/vituxanilesoveko.pdf
    • http://twdental.pl/uploads/1/3/0/6/130620436/1408882.pdf
    • http://carpetlands.com/uploads/1/3/0/7/130776008/lamaxev_tunijivi_jeroxubemipi_negevira.pdf
    • http://adrienneleigh.com/uploads/1/3/0/4/130476413/105600.pdf
    • http://173cy.bpmtc.com/uploads/1/3/0/8/130814296/929845.pdf
    • http://ww2.protrip.cz/uploads/1/3/1/1/131164113/0c1dc4f795.pdf
    • http://emberrosehtx.com/uploads/1/3/0/7/130740084/dbd3757c27739b.pdf
    • http://www.kkaiserphotography.com/uploads/1/3/0/6/130604429/f6007619566f2.pdf
    • http://surewayfinancial.ca/uploads/1/3/0/6/130622061/1087360.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_off000071d2.bin
708d03c683d5559678ede443973ab98e7b3226af804657a73de7193fa371dd1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D2 8872 bytes

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