Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4a635228b3aff9…

MALICIOUS

PDF

57.8 KB Created: 2020-03-24 02:30:58 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1a3b17d2e8ad6074e6b58dd9df12f8c2 SHA-1: 3614856794404b3afd2f1960ea8eabcb55395e1d SHA-256: 2a4a635228b3aff964a715e0a9af2a35f9b5b703b1e193356edc3f6e9939f1de
94 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links generated for SEO purposes. The document body contains a seemingly innocuous title related to keyboard symbols, likely a lure. The primary attack pattern involves directing users to a network of potentially malicious or spam-related PDF 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://kalajarvenlomakyla.fi/uploads/1/3/0/4/130435531/130435531.html#como+sacar+el+signo+de+menor+que+en+el+teclado
    • http://globalgraphicdesigns.com/uploads/1/3/0/5/130539912/kikowulisisesen.pdf
    • http://ocholistictherapy.com/uploads/1/3/0/6/130639681/2850980.pdf
    • http://fp-exch1.franklinpaint.com/uploads/1/3/0/3/130379293/venulir.pdf
    • http://commstech-hub.eisf.eu/uploads/1/3/0/2/130271073/7189611.pdf
    • http://mail.emeraldbible.com/uploads/1/3/0/5/130543092/levenezafazexap.pdf
    • http://mta-sts.mail.characterats.com/uploads/1/3/0/4/130488087/2068591.pdf
    • http://yourwellnessbranch.com/uploads/1/3/0/7/130775032/vizonifezenog_zinowo_sosujogiri.pdf
    • http://mummaherbssoftplay.com/uploads/1/3/0/2/130287898/c1c3a7303a.pdf
    • http://mta-sts.mail.tri-coachingpartnership.com/uploads/1/3/0/7/130738628/b808a4.pdf
    • http://elev8tionventurescorp.org/uploads/1/3/0/6/130620506/1469175.pdf
    • http://lopezponcehsec.com/uploads/1/3/0/5/130551524/sakegamupotutab-fulatipo-pawinebiwuxo-vufeda.pdf
    • http://cooltirewarehouse.com/uploads/1/3/0/5/130588789/wejilanawa-vitudi-wupibo-sinexebobu.pdf
    • http://mx.cropwellscouts.com/uploads/1/3/0/6/130620536/4528701.pdf
    • http://www.jeffandjohnnae.com/uploads/1/3/0/2/130287735/6353465.pdf
    • http://www.gettoit11.com/uploads/1/3/0/2/130289431/fimasegusabew.pdf
    • http://leverettsidingandwindows.com/uploads/1/3/1/0/131070718/kevatajigik-wuzafozirijesaf.pdf
    • http://www.crowdshoppe.com/uploads/1/3/0/5/130588686/jogamagojolu.pdf
    • http://progressivecommunityoutreach.com/uploads/1/3/0/4/130483847/72e3387.pdf
    • http://ifcava.info/uploads/1/3/0/5/130543466/793515.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086fc.bin
f706a199726b8de1466ce9a2e44c1a2ac330939cae625b89a1eec72fe5f5a76f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86FC 22912 bytes
font_01_sfnt_off0000c799.bin
4b25fdbda885a317fcca6a67b3176289adc8050e80911c5a2b947cbcb81a6b3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC799 6608 bytes

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